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I am trying to figure out eh best combination of weapons to put on my warriors and other large bugs.

I have read a lot of different posts about how dual BS are preferred to BS and RC, and no one seems to have love for the BS and LW.

So, here is my question. The bonesword causes and automatic wound, and insta-death on a failed leadership roll. A similar effect happens with the rending claws, but only on the roll of a 6.
If you are using dual boneswords with rending claw do you have the following effect, instant wounds, insta-kill on a failed leadership roll of 3d6, and on rolls of a 6 vs vehicles add a d3?

If not, then how does it work when you have mixed weapon effects?

Technically, the Bonesword doesnt cause an automatic wound, it only ignores the armor save. If something has sufficiently high Toughness (T9 and T10 to be exact) then the Bonesword cannot wound them no matter what. However no models with that toughness exist currently so it's not really an issue. Rending Claws, in the same situation, would Wound them, as it causes an automatic wound on a roll of a 6.

If you do have a Bonesword and Rending Claw equipped model, then yes it would gain all of that. All of it's attacks will ignore armor, automatically wound on a 6, Insta-kill on a failed 3D6 leadership test, and add an extra D3 against vehicles. If you take the Lash Whip, Bonesword and Rending Claws combo, you would have the benefits of all of those weapons combined.

Sorry, was miss reading the info from the codex, also I am still learning the order of attacks => roll to hit, roll to wound, armor saves, remove dead models.

So, to further dig a bit, I am trying to understand the favor of dual BS to LW/BS. Lets assume that I am using rend claws either way. The dual BS assuming it wounds, has a very slim chance of insta-killing high leadership models. Lets say a leadship 10 model, you only have an 8% chance of instant kill, but with dual BS you have a 50% chance. That increase is huge.

On the other side the lash whip can slow down multiple models if you position your model correctly, and dragging an model to initiative 1 is just evil since it give your army the full opportunity to kill it before it gets a chance to swing back.

I see both the options as ways to kill multi-wound models, leader models, and indy models.

I guess in theory, I could have my prime with the BS/LW and let his personal horde have dual BS, or vise versa and try to reap the best of both worlds.

The downside for lashwhips is they make units in base-to-base contact initiative 1, not all models in assault. So you'd have to position that Prime so it's in base-to-base contact with whatever you want to make initiative 1. They're both ace choices, though you really pay for them.

At the moment, I'm tossing up between Shrikes with dual boneswords or lashwhip and bonesword.

There are very specific purposes for those weapons. Dual BS is used for killing high wound models, such as other Monstrous Creatures and Characters. LW and BS combo is for killing high initiative and heavily armored units, or multi-wound models with low leadership. Good targets for the Lashwhip are Eldar Striking Scorpions, Incubi, Daemonettes, and The Keeper of Secrets, all of which will outpace your units and where insta-kill cant be used against them (in the case of the Keeper of Secrets, it has Eternal Warrior, while the other ones all have one wound each). If you go up against, say, a unit of Sisters Repentia, the Bonesword + LW combo will be seriously lacking, since the Sisters have a low armor save anyways, so the Bonesword's effect is almost non-existant, while they will go at initiative 1 anyways due to the eviserators they wield, also rendering the Lashwhip moot. Also, remember that if the model already has lower initiative than you (say you're facing a guard army) then you dont need the Lashwhip, since the enemy's already going after you.

If you want Lashwhips, give it to the Prime and get him into contact with models. Warrior squads have to swap out every single warrior with them, and that extra 5 points stack on very quickly. Dual Boneswords' effect is useful for killing other MCs (ironically it's the best against other nid armies) but it's also a very cheap power weapon, even by other codex's standards. Use it against armies with high armor saves, such as Death Wing, Logan Wing, and MEQs. Against ones with pathetically low armor saves, such as Guard, DE and certain Eldar Builds, stick with the scything talons. More actual hits that connect means more potential wounds.

Aw, well I am leaning my Warriors to be my answer to high armor targets stuff my Gaunts would have and issue killing. So, it would sound like Warriors with dual BS and rending claw, with a prime with BS/LW and rending claws is likely my best combo.

Keep in mind too, I am basing the off of playing only want coming in the Battleforce box and maybe an extra box of warriors, low point games around the 500 to 750 mark to get started, so I am not like to face many crazy army builds.

Bear in mind - you only get one pair of rending claws per box of warriors, so you'll have 2 pairs for your 6 warriors. You also do not get boneswords or lashwhips, which you'll need to convert or buy online from third party retailers. Paulson games boneswords are probably the best you'll find.