We have VZW and ATT as our only options here. ATT signal is non existent in our location and VZW is very weak, nearest tower is 5 miles through woods. We could just barely get one bar outside our home, and it was impossible to make a cell call.
After researching boosters, we purchased SureCall Fusion4Home with outdoor yagi (directional) antenna. We do bounce between 3G and 4G, but usually have enough signal now to make a call or browse internet. (Not strong enough to stream).
The most important thing to remember is a booster will boost a weak signal, and also noise. You need a usable signal outside to utilize a booster. If you have too much noise when talking to cell tower, you will always have slow connection, it's just the way the technology works. It prioritizes stronger signals first.
If you need any other info, let me know, we've had the booster for about 1.5 years now.