Hi All.
TL;DR: Ali or SS backplate?
I've searched, I've read, I've Googled & I've Youtubed. I've learned a LOT, but I have just one more question... :)
Firstly though, some background which will help:
I dive warm(ish). Generally, around 18 to 20'C, but frequently 16'C - 23'C. (East coast...