Skelta Vs WWF

I need to design a workflow application.

If we set aside the fact that the WWF is still in beta phase,

what would you recommend ; skelta or WWF.

I think that WWF misses some features like email etc but has a strong support.

Skelta makes the work very tedious like mentioning the workflow variables in different xml's, using its own libraries to access database etc.

Please give recommendations with reasons in support.

Thanks in advance