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what should i do.
use the squad for backup (on my side of the tabe)
or
Go for an all assault command squad

Either way im useing Tac marines, Devastators or Assault marines

Command squad can be great if fielding a battle company list. the main question you need to ask is what do you need them to do. I typicall field them with 3 combi meltas and a drop pod to have them drop in and destroy a hard target like sternguard, but instead of special ammo these guys get FNP and if you really want, they get access to storm shields and thunder hammers, lightning claws, or power fists for a better hand to hand capability.

Command squad (115)
2 melta guns (20)
5 storm shields (75)
5 Power weapons (75)
Company Standard (15)
Drop Pod (35)
Total (335)

I would never field them at this point cost but the point is you can do almost anything you wish with them which is what makes them good. When I field a fluff army I always field a command squad and use them as a replacment for sternguard. typically like this:

Command Squad (115)
Drop Pod (35)
3 Meltasguns (30)
Total (180)

They drop they kill the armored target then with feel no pain they Harrass the back field. I choose melta guns over combi meltas due to not having special ammo and feel no pain gives me a good chance to survive with those troops to kill other things. If I have points I give the meltas storm shields also for an extra 45 points it keeps them alive even longer.

It may not be the best but it is my opinion and what has worked really well for me in the past.

Red

I'd say to run 4 plasma guns or go all melee. 4 plasma guns on bikes is scary good, and the same price as a landraider.

I ran a 4 plasma gun command squad + captain with a plasma pistol, at rapid fire range it is brutal. In one game alone it murdered a deep striking old one eye in one round of shooting and then annihilated a hive flyrant two turns later (however on the hive flyrant I rolled 2 gets hot rolls which then failed both armour saves and FNP roll lol

You have to ask yourself why you are not using sternguard.
The answer to this explains how to load them and how to use them.

I would say in a drop pod, 4 plasmas with a little cc weapons, probably a flamer or two as well(you can take plasma and flamer on one model). This gives a nice mix with sternguard which can take all combis but only two special weapons, then haven't FNP for when their guns get hot. So sternguard(or even a dread) will be your melta and flamer pod, so 8 combimeltas and 2 heavy flamers as my favourite.

Otherwise on bikes with cc weapons and shooty goodness and some stormshields is a unit which is very unique. The only other units I trust in cc are assault termies, so this unit is a counter assault unit without bring a landraider to get them where you want them. Then t5+FNP with jink is just a really hard combo right now.

Most other roles look at sternguard.