I will select between Wilson NXT 18 and Mantis Power Synthetic 17 as a hybrid (cross) with natural gut (mains). I'm seeking to maintain close to the power of a full natural gut set-up, but achieve more spin potential than a full gut set-up. I've heard that Wilson NXT and Mantis Power Synthetic are both terrific strings, but don't have experience with either. For those who have tried these two strings, can you offer your opinion of which might work best? Thanks in advance!