I think the TS backroll is easier. A lot of the same rules apply from your HS backroll. Take a short approach, edge hard all the way up the wake keeping the line tight. Stand tall and throw your head back.
hips forward so your weight is evenly distributed across the board. I can't say you should approach with your legs straight. You want to come in with your knees bent so you can stand tall and push off of the wake. Focus on taking it as high as possible.
I've only just landed my first invert a few days ago (scarecrow) After trying a few frontrolls, I found the crow to be most natural to me. I'm sure it's all personal preference though. Now I've got to get my backroll!