Best mobile phone network. KL only - Data only

It looks  like I'll be popping over to KL for a short while so I'm going to need a short term SIM card.
I'll pop it into a mifi unit and use it for data only, then use the phones on WiFi, thus I'll have WA and so on without messing around changing cards in my phone.

KL only
Data only
Probably only about 2 to 10 gb data package, but no phone calls or SMS.
I have my own miFi unit (Unlocked to any network)
Best signal being the first priority

I gather foreigners need to use their passports for ID but cards are available for instant use.

Best network for the above?

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