Don't feel bad, I've been diving for 40+ yrs and don't get all the acronyms on SCUBAboard. But I'm also a Newbee to this forum.
Here's a different point of view ( would that be POV ? ). We used Scubapro Galileo Sols & Lunas in our training and diving. IMHO ( I believe this acronym should mean In My Humble Opinion ), they are the best.
They are Hoseless Air-Integrated Dive Computer ( HAIDC ? new acronym ). You can wear them on your wrist or use a retractor.
Question about transmitters; Do you use a remote for your TV or garage door?
Question about reliability of transmitters versus SPG; transmitters have fewer points of failure than SPG's. SPG's have a greater rate of failure IMHO!
Manmade gear will fail. If you are doing Tec diving or remote once-in-a-life time diving or you just have the desire to stay in the water, then have redundancy. Two SPGs or two transmitters, ect.
PM me if you want a special deal on a Scubapro Dive Computer ( SDC ), New or used!