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As I am a sucker for fluff armies I kind of let them influence my list building, but which one of these do you guys think is going to be more competitive as a take on all comers army.

SM 1498/1500

HQ 1
forgefather vulkan he'stan-190

Troops 1-138
x6 Scout Squad-88
snipers-free
sergeant Telion-50

Troops 2-180
x10 Scout Squad-140
snipers-free
heavy bolter-10
camo cloaks-30
(this unit will turn into combat squads upon deployment)

Troops 3-215
x10 Tactical Squad-170
flamer-free
heavy bolter-free
combi-flamer-10
drop pod-35
(Combat Squads upon disembarking)

Troops 4-215
x10 tactical squad-170
flamer-free
heavy bolter-free
drop pod-35
locator beacon-10
(Combat Squads upon disembarking)

Elites 1-200
x5 terminator assault squad-200
thunder hammer and storm shield-free

Elites 2-185
x5 sternguard veteran squad-125
x2 meltagun-10
x3 combi-melta-15
Drop pod-35
(suicide tank killers)

Elites 3-185
x5 sternguard veteran squad-125
x2 meltagun-10
x3 combi-melta-15
drop pod-35
(suicide tank killers)


Now this is my fluffy tyranid list.
1495/1500 tyranids

HQ 1-315
Hive tyrant-170
wings-60
regen-20
old adversary-25
twin-linked devourers w/ brainleech worms-15
heavy venom cannon-25

HQ 2-160
The parasite of Mortrex-160

troops 1-50
10 Termagant-50

Troops 2-50
10 termagant-50

Troops 3-250
Tervigon-160
catalyst-15
regen-30
toxin sacs-10
adrenal glands-10
crushing claws-25
(anti-tank unit)

Troops 4-250
Tervigon-160
catalyst-15
regen-30
toxin sacs-10
adrenal glands-10
crushing claws-25
(anti-tank unit)

Elite 1-130
Doom-90
mycetic spore-40

Elite 2-95
1 Venomthrope-55
mycetic spore-40
(to give cover to parasite and gargoyles)

Fast 1-60
10 gargoyles
(to give more wounds to parasite)

Heavy 1-135
3 Biovores- 135
(anti-infantry)
(I can also split up into 3 heavy units)

I am not interested in changing these lists at all. I am just wondering which one do you think will do better to take on all comers, (primarily, Necrons (without flier spam), Dark Angels, and Dark Eldar. But I want to be prepared for anything without have to change my list before game)

This might be better in the 40k lists section.

Of the two lists the SM seems more competitive. vulkan is a very powerful HQ and his army upgrade is just sweet. I would suggest a few minor changes like missle launchers for the Scouts and Tactical squads but not much else. Multimeltas are also another good option for the tactical squads too.
The Tyranid list needs work which could pull it away from the fluff army you had envisioned. I would recommend dropping several things and changing some around to be a more competitive army.

SM list hands down. The nid list needs to many tweaks even with out doing major unit overhauls. Just swaping the HVC for the Stranglethorn, will save 5 point and be a better weapon choice and keep the list flavor.

You might consider switching some things around in the tyranid list. Tervigons to spawn gaunts. Genestealers. Maybe more fast attack.

The marine list looks good. If your playing against weak infantry (guard for example) maybe you run a whirlwind or two.