Found the answer after talking to a friend in the gym.

OK.. cypionate is an ether, makes the 1-test last longer in the body.
Anything that's in powder form can be injected.
Spray vs. Gel is a personal preference, but IMHO its stupid to use a spray because it mists and you don't get an accurate dose.

Its probably better to use a gel because you can apply an exact amount and not miss.