Depends on what part of the game is important to you. I'd think 3/3 Incite will benefit more tanks though. Right now in most single-target tanking scenarios you should be able to HS almost every swing (again, this depends on the rest of your spec, your gear and what exactly you are tanking), in which case 15% crit will easily surpass the benefit of Imp. Revenge from a damage standpoint alone.
On top of that, Glyph of Heroic Strike returns 10 rage on HS crits.
If you do any prot DW DPS, Incite is obviously beneficial while Imp Revenge isn't.
Lastly, the extra crit on Cleave and TC helps with AoE tanking.
Overall just a much more versatile talent.
Imp. Revenge is a very nice talent as well, arguably more beneficial than Incite for solo grinding, tanking 5-mans and for PvP. Personally I would try to squeeze both talents in pretty much any build, unless I needed to free up points for some very unusual combination of defensive talents for some "gimmick" encounter.
I don't have time to do math right now, but I think most of this should be pretty straightforward. Up to you to decide if it applies to your particular case.