Casual or Semi is totally up to you. You can't make a wrong choice there unless you have a specific purpose in mind htat one is better suited for.

The selvedge fringe was a concern to me also but I really like the rugged look it gives to the casual kilt.

My best advice is go with the casual if you don't already have a casual kilt. They are perfect for any type of wear from hiking to dress up events. I even wore my casual to a wedding with a PC style outfit and it looked great (if I do say so my self )

You can always get a semi later