If I can throw my two cents in, it highly depends on build composition like stated, and because of the arguments made for both, it shows they both have pros and cons.
There is one thing people haven't mentioned though, and that is Objectives. If you run more raiders, you can get more Kabalites which are fairly expendable, and objective secured.
But if you run more venoms, then you can spread out your forces more, and thus theoretically get more board cover.
I personally prefer venoms in a flayed skull detachment. Standard Blaster per venom, but it's a rare game where you don't have objectives, and both transports should also be considered for their worth as an objective holder. While not expendable, a single venom is much easier to sacrifice to gain those additional victory points, and arguably more likely to be around at the end of the game due to how they play.
"After spraying your project, allow the solvent to completely evaporate before mating for immediate bond. Once mated, you cannot reposition your substrates."