I have the American Professional 2 and like it but it is a strong sounding guitar
especially with the middle position push button. Its hard to see the Deluxe
equipped one with humbucker being much stronger or different. Anyone own
both to compare as I've thought of adding the Deluxe but don't want to spend a
lot for something very similar or only a little different than the AP2 I already own.
So it sounds like the American Pro 2 gives something of a P-90 type thing instead of humbuckers. It sounds like addingCaveat - I have not played the current American Pro II Tele Deluxe model so I don't know just how powerful the humbuckers are in it.
That being said your American Pro II Tele gets you one kind of humbucker-sounding/thicker sounding setting. With the American Pro II Deluxe you're going to get the that thicker humbucker sound from each pickup in each position. Unfortunately Fender doesn't have the "Service Manual" up for the Pro II Deluxe model; they do have it up for the Pro II HSS Strat and the version of the Double Tap humbucker in it is very low powered - about the same as a Strat single coil in humbucker mode, and half that output in single coil mode. And the humbuckers in the previous American Pro Tele Deluxe were low powered as well.
So you're going to get a somewhat Les Paulish sound out of the American Pro II Deluxe model; while the American Pro Tele in that series mode is thicker and kind of humbucker-ish the ones I've played just gave you a thicker/louder sound as opposed to a true humbucker sound (and that's not just the American Pro II Tele; that's pretty much any Fender Tele that has the series wiring option).
So it sounds like the American Pro 2 gives something of a P-90 type thing instead of humbuckers. It sounds like adding
the Deluxe model would be redundant if you already have the AP2, not enough difference to make it worth it. I do notice that the AP2 gives a much stronger mid range sound including the back pickup. My 83 standard has more of that treble Tele sound. Both Tele's but different.