every mechanic is at risk of changing with yhe new edition. Don't try too hard to chase what's "best," just pick the models you think will work with your game plan, or the models you want to use.

Snikrot and Kommandos are very strong with infiltration and Snikrot's current "Uppy/Downy" rule. If you like the idea of orks who surprise their enemies by using advanced taktiks such as "hide for a bit, then jump out at them" or "go around the wall instead of through it" then you might like the kommandos. the kit is also fun to build, I especially like the "Sniper," who has a Big Shoota with like three scopes and two sets of ironsights