Its kinda like splitting hairs here. Cake or Pie? Both are great but are you really hurting if you get a piece of cake instead of pie?
Both +Hit and +Exp provide solid threat/DPS benefits and I think its more important to factor in the overall quality of an item before worrying too much whether you should stack hit or exp.
In other words, don't sweat it. You're not 'wrong' for choosing one or the other.
Personally, I'm going for +hit after dodge cap for all the reasons listed above. If, for example, the legs off of Malygos fell to me and took me from 26 EXP to 30something, I don't think I'd totally rework my gear to make it fit. (oh who am I kidding, I'm a freak like that...of course I would especially because I am wearing pants with alot of hit and it would be a nasty drop to switch)
Twilight Opals are relatively cheap and I have the 8EXP/12Stam cut. I had been using 8 hit/12 stam in yellow sockets but at 31.4K hp, I'm solid on EH so +16 hit for further sockets.
What this really comes down to are instances where you have an open yellow socket and if you're gear like I am, you have to choose, assuming you don't want more Def, hit/stam or straight hit or hit/exp. At dodge cap, I'd prolly go straight hit. but any of those choices are good choices....like having to decide between cake and pie :P
your hat may be nice, but I have the little white tank top that says Legendary right across my boobs. I win. (or more correctly, H wins)