astro list choices

so torn between 2.

1497 marines
HQ
pedro kantor 185
Elite
5 Sternguard 4 combimelta droppod 195
9 Sternguard 4 combiplasma lightning claw droppod 298
Troop
10 marines grav gun, heavy bolter, rhino 200
2x5 scouts sniper rifles camo cloaks 140
Fast
stormtalon skyhammer 125
Heavy
6 devastators 2 lascannon 2 missiles 154
thunderfire cannon 100
Fortification
Aegis with quad gun 100

or...

Chaos 1374
HQ
Huron 160
allied black legion sorcerer mastery 3, spell familiar, last memory, gift, veteran 170
Elite
Helbrute missiles, reaper AC 115
Troops
9 CSM rhino, meltagun, combimelta power axe, gift 217
11 cultists flamer 59
allied black legion CSM 5 rhino, power axe, veteran, gift 140
Fast
Heldrake baleflamer 170
Heavy
3 obliterators nurgle 228
5 havoks autocannons 115
idea is infliltrate sorcerer rhino and start mass aoe very quickly to hinder troops while everything else pounds away at armor and heavier units.

Not sure what to do and still need to paint stuff for whichever force I go with. Ideas?

With out seeing points costs, I'm unsure what they look like under the composition charts.

I see -1 from more than 1 elites choice. for sure. Where does the Quad gun sit for composition scoring?

As for the chaos list, Hellbrute? They any good even? lol
Only 11 cultists? They cannon fodder or to be held back on objective? May want to look at the missions, not sure

helbrute is a fire platform. i like model so meh to rules. cultists are cheap second troop for primary detachment

Marine list is better. 16/20, I think.