Definitely this is currently the most significant "ick", as they say, in Perspective. The usability of the power chart at the moment (8.1.24) is awful, and I've already had a big rant about this [FEATURE] Increase usability of the Perspective Power Chart component
Apart from that though, I would choose Perspective over Vision hands down, simply due to its creature comforts like binding transforms and CSS styling / Perspective Styles. The latter makes standardising styling so damn nice, especially compared to vision which simply doesn't have a nice way to do this. Perspective can handle multi monitors, I'm not sure about the opening of popups on specific monitors though, but definitely you can choose to open specific pages on specific monitors in the config