Before anything else, if you don’t know what parts do i highly suggest you go read this great guide by @VaultHunter101
Now as for the discussion topic, let’s debate matching grip vs off brand grip and other various parts.
I’ll preface this by saying jakobs, torgue, and dahl should always have a matching grip if possible
Valdof weapons with very high fire rate are better off with jakobs grips for increased damage imo.
They normally have good mag sizes, so matching grip doesn’t benefit in that area as much.
Jakobs grip increases damage, which some vladof weapons could do with a boost to
Yes jakobs grip decreases reload speed, but every character has at least 1 skill to help negate this
Hyperion guns especially can greatly benefit from bandit grips.
Hyperion grip decreases damage, which sucks
It also increases accuracy, which on Hyperion weapons is pretty much wasted.
Bandit grip increases mag size which is great.
Doesn’t decrease damage which is fantastic
They do decrease reload speed, but good Hyperion guns reload decently quick and as i said above all characters can at least partially combat this.
I know i didn’t cover everything, but that’s where this fantastic community comes in to play
PS. Stocks are also very debatable