Fly Fishing Shaman
I think the Meridian in that weight is faster and slightly lighter on the swing, than the Xi3. But like Steve mentioned, both are cannons with the right casting stroke. Of course, the Meridian will cost you a few more coins, since the rod is newer. But like Steve mention, if you have the chance, cast both if possible and see which one fits you better, tho you will be hard pressed to find a Xi3 in some shop since they were discontinued years ago, outside of a friend that will let you cast theirs.