My sun broadband stick hasn't given me much headache. I have globe unli data on my phone and I've had quite a few billing issues.

sun doesn't have LTE, just 3G. Problems can also arise from your location. Sometimes the signal is bad in certain areas for specific providers

Globe in metro manila is decent but in the province it sucks beyond all comparison. I'm on prepaid; no billing hassles.

Medyo nahihinaan ako sa Sun (base sa karanasan ng kuya ko). And I wouldn't dare tell you to go Globe so I guess the next best thing is Smart. :/

I've been with SMART for some years, it's okay.