My opinion would probably be the warrior. The new 172's are very well equipped and stable but not as easy to land which can result in a lot of frustration not least some strange looks from your instructor.

I have flown all four aircraft, and instructed on C150, PA28 and Katana DV20/DA20.

If the C152 is really a 152 and not a 150 then this is an adequate training aircraft if you are on a budget. The C172 and PA28 will both make you a better pilot as you do have to fly the aeroplane properly.
The Katana's might be a bit of fun to fly but having done 500+ hours teaching on them I do not think they are a good basic trainer.Mixture control, missing on the Katanas is a basic.Constant speed prop is not needed at this stage of training.Also they are difficult to land and will cause you a lot of frustration at a time when you need to feel a sense of progress.Having said that they are OK to convert to later.Better that way round than learn on one and then have to learn basics again when you convert.If your option is one of the newer Katanas ie 4 seater or continental engine, then I haven't flown one yet so wouldn't like to say.

All IMHO.

Ans PS. Rusty Cessna is right Katanas are cramped inside - big time. Absolutely nowhere to put kneeboards and charts etc when you're not using them.

[This message has been edited by 'I' in the sky (edited 26 March 2001).]