Any real-world difference between -R and +R?

[Dr. M. Burek]

I'm looking to buy a DVD burner. However, with all of the standards and 
everything, I'm a bit confused. Is there any real-world difference 
between DVD's burned as -R or +R?

I know that OS X can't read +R (a strike against +R), but that's all, 
really. I'm trying to decide if I should get a cheaper -R/-RW drive, or 
go with a more expensive -R/-RW/+R/+RW drive.

So, why do people use +R? Cheaper media? Better Media? More compatible? 
More capacity?

Also, what is a good brand/model of media to get, that is reasonably 
available, especially in stores (not necessarily online)? Looking 
primarily for compatibility & price - capacity not an issue.

thanks!