Would it be better to stay with T-Mobile or switch over to Verizon?

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I have T-mobile right now and really the only places I don't get service is inside big buildings and my house.
The only reason I would really want to switch to Verizon would be to get more service in more places.
Like if I ever needed to use navigation or find a restaurant or other place.
Would it be worth it making the switch?
I tried going to a Verizon store today but they kept trying to sell me the Iphone, I don't like buying apple products so I just ended up walking out.
I don't know if it was that salesperson in particular but I don't or ever will, buy any apple product.
I wanted the HTC One Max, I have the HTC One right now.
Would it be better to switch to Verizon?
i'm heading to college soon and it would be nice to have service at all times.
or how much better is Verizon than T-mobile?
Should I just stick with T-mobile and get the HTC One Max, from them?