Should I get puck or angled puck transducer for inhull mounting?

Rather than the transducers (trolling motor mount I think) that I was given.

Doesn't Humminbird have a transducer swap program?

I think I read something somewhere about this....would I do best to exchange my transducer for puck style? Which kind do you think?

Before I mount I want to make sure I'm mounting right kind...

My Humminbird transducer was arrowhead shaped with a couple of holes near where the wire comes out to mount it somewhere with a bolt.  It is flat on the bottom, tho, so I Gooped it down, and it worked many times til it started to come up, giving me wierd readings. I don't know if what you got was like that, but if it has some kind of flat bottom and isn't too b ig, it will probably do fine thru-hull.
  When it started to peel up,  I just left it in place and built a well around it  with a 3" PVC fitting - like a straight cylinder, tho I rasped(filed) it a little to conform to the bottom shape, gooped it down really well, filled it with salt water, then used a neoprene cap with a radiator clamp (sold at OSH to plug sewer pipes), ran the loose end of the wire thru a hole I cut in the top and gooped up the hole, and it's worked fine since.

I use Fuzzy Tom's technique as well but I did not make the water in the pipe permanent, I drain and refill everytime. Works great and it makes the FF a bit more portable since the transducer is not permantly goop'ed down.