I think this is a fair assumption do you agree?

May be...

F1 - the best car generally wins. I agree
A1 - the best driver generally wins. I beg to differ.
Why? Because generally teams(or Countries, should I say) with the best and most experienced engineers generally are able to set up the car best for a particular track, given that the cars are all standard. If you look at the past few years of A1, most countries that have a heritage of motorsport generally perform a lot better over the entire season than countries that don't. So you see good and consistant performances from European countries such as Germany, France, Great Britain, etc. whereas Asian countries perform a lot worse. Driver wise, yes, some of them are better and more experienced than the others, but generally they are all pretty competent.

One part of the equation you are forgetting is:

A1 driver = F1 dropout.

I've said this about F1 cars/drivers in the past, and F1 fans jumped down my throat in defence of the ability of F1 drivers in lesser cars to overcome this theory, however you can't dispute the fact that Hamilton just isn't at the races this season with the car he has to work with, and Button has suddenly become a real Championship contender, but the staunch F1 fans would still have you believe that it is still all about Button than the much better car he is driving, dream on F1 fans.

F1 = the best car generally wins
A1 = the best driver generally wins

Up to a point I agree. at the moment in F1, the best drivers aren't in the best cars ( I believe Alonso, Kubica and Vettel a match for any Ferrari/ Mclaren/ Brawn driver).
But its up to each team to produce the best car, all teams apart form force India and Torro Rosso have the budget to produce a world beater but for one reason or another don't. Most years in F1 (not every) more than 1 car is capable of winning races, last year McLaren, ferrari, BMW and Renault were at times, the best. F1 has a relative freedom in car design, pushing to be the best of the best in technology, which i feel is a large part of the appeal.
In A1 GP, the cars all have the same motor and chassis and its up to setup and skill to come out on top but there is no real team to support, just country, which I feel isn't right in motor sport, this is why I never watch GP2 and A1 GP, each race series has their own rules and fans, which is fair enough.

I would agree with that, but then again every once in a while the dark Horse jumps up and rears it unruly head.
Such as Daytona and Talladaga when the big one happens.
I mean look at how David Guilliand got into cup cars. Granted he has been around for a while but it was totally unexpected the way he won his race and got a cup ride.
But now he is showing what he is made of with an unsponsored team, and I wish him all the best.com1 irq