if you travel a lot, choose celcom.. i use celcom d98 (3.6mbps) for my data plan. d68 (512kbps) also okay.

but celcom got to many subscribers, resulting their network become congested at certain area during certain time. however, overall i satisfy with the service.

choose digi if your place is covered as they provide better internet service (i heard so)..

if digi got only gprs, try celcom..

but in my experience, if you simply want to surf facebook, whatapps, etc.. gprs is enough already.