it depends on how you use the phone.
if you want for mainly camera & music, then go for SE .., and if you using this phone for mainly internet access and others simple purposes 6233 is the best...
i prefer nokia 6233 because it's
1. it's 3G man, be futureproof...
2. it has class 10 EDGE, that means you can use your phone as modem in good speed.
3. it has stereo speakers with 3D effects
4. 240x320 display
but it also lacks some features,
-no front camera
-no flash for camera
-radio is not RDS
-only 6MB internal memory
check features of 6233 and w700i
*www.gsmarena.com/com
pare.php3?idPhone2=1387&idPhone1=1527