Why would you use tape and peel ply for an emp tip seam?
Tape is usually 8oz fabric or higher, and has one selvage edge and one woven edge. The heavy fabric weight is thick, and the selvage edge is even thicker. The result is a raised strip (0.010" to 0.020") which will be obvious unless (a) faired over a large area with a lot of filler, or (b) sanded heavily, or (c) both.
A recent accident report listed mass quantities of filler on a control surface as a possible contributing factor. Enough said.
Heavy sanding makes the peel ply application pointless. Heck, it makes the heavy tape pointless.
The lightest control surface (most flutter resistant for the least total weight) will be the one with an exposed seam. If you wish to hide the seam, do so using the least possible material.....which isn't a heavy tape strip and the filler to hide it.