So my question is, who has experience with these plans(-built
aircraft) and can recommend a set?

You listed a lot of good options that I elided - just to make it harder:

A couple years back, I ordered the preview plans for Vans RV-9A for $55.
They are still that price (RV-3 is $45.) As far as I know, the only
difference between Van's Aircraft preview plans and the final set is that
the preview plan drawings are reduced in size by half (I think) - but they
are all there and quite readable. Also, you get the complete build
instructions plus other material. It's a fabulous deal education-wise even
if you design or build something else.

I've got copies of many of those you've mentioned.

The absolute gold starndard for learning are the Pazmany PL-2A and
PL-4 plans. Extremely well designed details, very well organized, and
very clear. The acompanying manuals are worth buying even if you
build something else. The RV plans and the Sonex plans are very close
to that in quality. I would guess the Thorp plans are similar; he
made his living consulting for "REAL" airplane companies, so was
familar with standards of practice as they existed at the time.

The Ultracruiser plans are a step down from that in terms of clarity
and presentation, but are still quite nice.
The CX-4 plans, another step down, from an "Art History" standpoint,
but the details are very good. The CX-4 plans are also nice in that
they have a lot of details, like firewall forward stuff, that most
other plans leave as "an exercise for the builder". But the sheets
are not well organized, it's hard to figure out the "next higher
assembly", etc.

The Teenie plans are a total joke. I have not heard good things about
Zenith plans; most of their planes are built from kits, with the
tricky bits, the ones hardest to document, already done.