You probably realise that your question is one of those "can of worms" instigators.

Well, I've never been one to shrink from controversy, so here is my opinion.

Firstly, one of the very best and most practical trainers is the ARC Ready. I say this because it flies well, is tough, fuelproof and quite attractive. You may have difficulty in sourcing one, though. I think that the Chinesemight have done them to death with their cheap imports.

Secondly, I would recommend that you learn to fly using a modestly-powered model. This will compel you to be considerate of the aeroplane's wing... and this is the model pilot's primary skill.An ARC Ready with a .25 or .30-sized two-stroke engine would fit the bill.

You can always fit a larger engine at a later date.

If you do fit a very large engine, you may find that it gives you problems when landing. Even at idle, it maybe developing sufficient power to sustain your model in flight. So, you'll struggle to land your aeroplane with accuracyand may not learn how to properly control its glidepath and approach "speed".