Which is easier - Front or Back tumbling?

For me, back. Once you get into more advanced tumbling the front tumbling gets pretty difficult. I think it's because it's easy to get momentum out of a back handspring for a back tuck or a layout full or whatever, but when you're coming out of a front handspring sometimes you've gotta really crank it to finish the front layout or whatever comes out of it. Just my opinion. :) I can understand why back tumbling seems harder to you - when you're first learning it's a much scarier motion than front tumbling, but it's fun! Keep working hard!