I just came across this comparison video of the Zpacks Plex line of tents. Specifically the SolPlex, AltaPlex, and Duplex. It is the best comparison video i have seen. There is a lot of info on the duplex but not much at all on the soloplex and altaplex. If you do not have the luxury of being able to compare these tents in person I think this video is a must.
p.s. I have no connection with the maker of this video.