I'm sorry in advance if i'm repeating something of someone else w/o giving due credit...i'm at work and can't read the whole thread.
All reception issues aside, TMob is arguably now the No.1 carrier 'since they went to TRULY UNLIMITED data'.
The only major competitor offering that same level is Sprint--albeit at a higher price(Metro cheaper but doesn't compete on speed or phone selection, i'd rather pay a few dollars more. Plus in that case, one of TMob prepaid mvno's would compete on price).
Even more important, even if Sprint were to match prices(unlikely), TMob is gsm/switch sim....allowing bringing other models over, facilitating worldwide travel, etc.
Of course, in the unlikely event that truly unlimited gets rescinded...then someone else could be the choice.
Now you just have to ensure no TMob coverage issues in your neck of the woods + wherever you travel.