Reliance or MTS?

Okay so I have two numbers with me. One aircel and another idea.
Idea is used rarely. Mostly Aircel is used and I don't make STD calls much. It is not a necessity but might use it.
So I was thinking of porting my Idea number.

Have these following questions in my mind
1. RIM or MTS? (Depending on coverage and tariff)
2. GSM or CDMA?
3. Prepaid or Postpaid?

I need it for STD calls of about 120-200 minutes/month. May or may not use data. If need it, then 500 mb/month is enough for me.
No SMS balance required ever
I mostly stay in Delhi/NCR and go out once or twice in a year for a few days. Mostly UP so gotta see if it's available there but not a big deal if not available there.
 
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