They aren't that popular anymore, but back in my day, the (THE) advanced trainer was the Sweet Stik, (or Ugly Stick). You still have the high wing stability and you have the maneuverability and speed of a symmetrical wing. It had a good thick wing that was capable of high angle of attack, low speed approaches. This was great for learning how to slow down the hot planes still yet to come. They were rugged. And if you threw away the wire gears and installed aluminum one piece main gear, you could slam them in all day and not worry about damage. They are like tanks. And if you eliminated the dihedral , (simply throw away the stock dihedral brace and cut a straight one), you would have a pretty hot and agile aerobat. It was common to see 6 or 7 Stiks at the field, sometimes in the air all at once playing chase !! Thats funny because they were all mostly red with just some white squares and black iron crosses.
There are some ARF versions available. But they just don't fly very well with the factory dihedral, ( in my opinion). Modeltech sold a great ARC version with a foam wings covered in balsa. It was a simple matter of holding the wing section on a belt sander for 1.2 seconds to take the dihedral out and transform them into a T38's ugly sister. And I see OOP Sweet stik kits on Ebay. I'm not certain if they are still produced.
If you ever saw a Sweet Stik on approach, nose high, slow, and sinking like a Learjet, you would see instantly the appeal of the design. They teach you to land properly. They teach you to use the throttle on approach. The 4*s are the popular Advanced Trainer today. But I see too many folks successfully land them with very poor technique. They seem to glide them in. The Stiks will reward you for doing it the right way. Add they fly just fine in gail winds or calm air.
Biplanes can be pretty tricky to set up properly. Lots of test flying and adjusting. And they glide like bricks with all of that drag. I would wait for a bipe. Test flying and training , even advanced training is a poor mix.