I'm also a longtime WF customer and needing to move. A comparison will be essential. Most of what I have is custom PHP, but also a WordPress site or two, some Python test projects as well as Django on one or two of them, NodeJS for a service, and one Ruby app. But, also have many domains I have parked.
It seems OpalStack can handle this, but my questions I don't see answers for that I need to plan out are:
1) Moving email accounts, including a couple I have for others that run on one of my domains and sorting out their access to reset their own passwords
2) I have some .htaccess running and not sure if they will still run, if so that is great
3) Any scripts or support for shifting things to Opalstack? WordPress? Etc?