FireRed generally has the best compatibility with tools as well as lots of documentations, not to mention JPAN's engine and Jambo51's upcoming 649 Patch so most people look to hack it initially. I would say that Emerald is on average used by more advanced hackers as they have a lot more to figure out/ explore and there isn't as much free space available to expand upon. Since it is your first hack I would suggest trying out FireRed as there is far more information to guide you and move on to Emerald in the future if you feel like doing so.
After a week of exploring i have updated my R4 silver into 1.28 which is the new one of today and now i can play Pokemon Plus Nobunaga no Yabou on my DSi. I feel very accomplish since my R4 was a pain to look for its updates. Still need some one to wifi battle test. Also how are you doing?
Omg, i was thinking on asking you something. Also i use a DSi. and my question to you is if you can help me test my wifi on my pokemon black and white in battle. Because i'm new to the R4 and i'm not 100% sure if i can wifi battle anyone on it. And how has it been?