Load out decision paralysis

Hi all,

Need advice for building 20 man sons of Horus assault marine squad

The confirmed: 20 man, 4 power weapons (2 swords, 2 axes). Power fist on sarge (plus usual goodies).

The decision paralysis.

Plasma pistol sarge, yay or nay? I have plasma pistols on all my tactical squad sarges (3x 20man squads) so is it worth it for my Assault marines?

The big paralysis: combat shields, point cost Vs effectiveness. Are they worth it?

Cheers in advance