I would depend on what you were really looking for in the light. What is important to you: variable levels, battery life, color rendition, simplicity? Can you give us a little more information on possible uses?
I think the T1A is a wonderful. It's small, very pocket friendly, amazing simple infinitely variable UI. Will last about 2 hours on a brand new CR123 at full power and much longer with lower level usage.
The E2e is also a great light, but as others have mentioned it will chew through more batteries and it doesn't have variable levels. Yes, you could get a LED dropin for it with multiple levels but then you will need to get a clicky for the tailcap - and down the road of modding and increasing expense you go. If you are thinking you may end up going that route I would just start with the T1A to begin with.
Lots of other wonderful lights out there too, but you personally picked one of my top favorites with the T1A. It's a rugged purpose built light and I think it'll take more of a beating than many other lights out there for day to day pocket use.