There are many weapons in the game, sometimes you just don't want to think "is it really important if it's fitting for my Perk?" Well I've got you covered. Just take AABAA on S.W.A.T.

Swat has 4 Perk Bonuses. Only the Damage and Mag size are Perk Weapon relevant. Switch speed is always useful and bullet resist, while barely ever applying, does make you just a slight bit more resistant to bosses.
It's simple, really Lv5 & 20 A are armour related, so they can be good on all. Both together save you 215D each wave by giving you 75% for free.
Lv10A also is simple. The backup pistol becomes quite a powerhouse with this, its only weakness is becoming the same thing it was famous for in KF1, ammo total. This bloody thing has good damage per mag, good enough to tear through the first 3/4 Waves on Sui, the highest difficulty I'd recommend you use this fun little strategy on.
Lv15B is self explanatory too, taking an SMG along with a high damage Bosskiller is always useful. Even if it's one of the lighter ones, you'll have ammo up the wazoo on this rather expensive Perk.
And Lv25A is quite fun to say it simple.

Glock 18 + Shield, take less damage in sticky situations.
Nailgun, just one of my favourites even unupgraded.

Enjoy being better than survivalist.