Personally I have to give the edge to CDMA just because it's what I'm used to and I prefer the faster data access's available. Just need to get a few of the nicer phones away from being GSM only .
UK also has GPRS - I'm on that right now. GSM - Pay for time on the WAP GPRS - Pay for only the data you receive. Like before it cost me about £1 to find a ringtone etc, and download it off of these free sites - www.free-ringtones-free-logos.com - choose a logo, poly ringtone etc and it gives you a code - www.dm1.net I think. Go there, enter a 4 digit code and the tone etc d/ls to thew phone. Costs me about 3p thanks to GPRS