Use a combination of all services depending on your need.
Stick to one service and you will get conned more often, despite the speed
Stick to the other and the ETA of your 30KiB mail attachments will be same as a fedex package from the states.
USB modem/dongles are only viable if you have a laptop, otherwise if its for home STAY CLEAR of them and seek a decent ISP that will give you wimax or fibre.