...All biscuit joiners do the same thing...
They are supposed to do the same thing, but the results will not be the same.
The ones with the "vertical" motor, like the Ryobi pictured above will give you bad results every time. They tilt as you push the cutter in, which widens the slot, giving you a too loose fit.
Do yourself a favor and stick with a biscuit joiner that has an inline motor. These go straight in, and make a well fitting slot. Suddenly biscuits will go from a lousy solution to a good one (in some uses).
Also, the plastic fences like you find on the HF model flex. If you have the HF, you can improve it by sticking a piece of sandpaper tape to the face so at least it does not slide around.
My Porter Cable was not that expensive. It has a great aluminum fence that drops to square reliably and does not flex. The measurement gauge is so-so, but I can deal with that. The dust collection is as good as it gets (nothing escapes). What's not to like?
I have both....biscuits and pocket holes have different specific uses. I wouldn't use biscuits for face frames....but biscuits work great for joining the side of a cabinet to a face frame.....or joining two lengths of boards together to make a wider board.
Bang for the buck? Ryobi. Or any decent used one.
Yep, biscuits and pocket holes are different tools for different uses. Domino is another one with little overlap.
Pocket holes are all nice and that, but are just about worthless in plywood.
Biscuits are good where you want a spline for either strength or alignment, but want it hidden.
Domino is a tenoning system (NOT a spline), and I can think of no places where a biscuit should be substituted for a Domino and vice versa.