Well, my best recommendation, as has already been stated is try them both. The great thing about humanity is that everyone has a different opinion, a different cup of tea. Another good way is to go to the respective forums and website of each of the mods, and just check them out. Look at the discussions and things like that.
I actually did that myself. For me, the biggest factor was initially the map (I picked RTR first, and then switched to EB later), and secondly the much greater attention to historical detail on the part of EB.
However, the important thing to remember is that they both are quite different. Playing both, I felt that RTR moved a lot faster, and overall, felt sort of like a beefed up R:TW. EB, on the other hand feels like a completely different game. Everything is so disorientating at first, and the gameplay, based on my observations, appears slow to the extent that it would be frustrating to a long time vanilla player.
So my recommendation is if you are looking for an improved (much improved) version of the game you are already playing, go with R:TR. However, if you are looking for a highly detailed, extremely historically accurate game, which emphasizes accuracy over gameplay, go with EB.
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