The bot you use should really be dependent on the map, players and your own personal play style.
For example if I were going to be doing a map where the bosses were the most difficult and time consuming and I was a patch I would go for the dark-bot to get the TA but if I just had to take down countless small enemies I would go for the v3 as it gives a damage boost in trans making them die faster.
PvP is completely dependent on what your play style is. If you are a patch that is going to want to do massive damage when others are in trans then probably the darkbot but other than that I would probably go for the v3 but that's my personal opinion.
As for raid 235 I would use darkbot as there are quite a few transed mobs and if you're patch (which you probably should be in 235 raid) then you will be able to deal massive damage without taking damage. In raid 235 there aren't many times when you want or should trans so the effectiveness of the v3 goes down.