IMO none work well enough to convert any VFP program. Recital does not have a real window form and I consider Recital to be the best. You'd be better off using wine to run VFP. It works very well.
I realize that you don't want to rewrite the program but you might want to look at Python - it's very close to VFP as any other lang I have found for Linux.
John
John Fabiani
Woodland, CA