In my opinion, perch of similar size are easier to fillet. Of course, you may need to fillet more perch if they aren't large!
I use an electric knife for LMB. It won't easily go through the backbone, but will go easily through the ribs. Don't fillet all of the way to the tail, but flip the fish and use the electric knife to separate the fillet from the skin.
Then use a small, sharp knife to cut out the small section of the fillet containing the ribs.
I have used the same method for YP in Canada, but it has been so long since I was fishing up there I don't remember how the YP compared to my usual LMB cleaning (or to the SMB I was simultaneously cleaning with the YP in Canada).
