I think the fact that not a lot of people tune Corollas is more the reason why I like mine. That way I can make my Corolla stand out. A modded Civic is about as predictable as a veto from George Bush. Now a modded Corolla, no one would expect that to come.
Personally, I think the primary reason Corollas have little aftermarket support is because there's no coupe version like there is with the Civic. Toyota as a whole has lost much of its sports market with the demise of the Celica, Supra, and MR2. I don't know how Toyota managed to f*ck it up so bad; they had one of the best sports lineups in the 1990s.
Even tho stock Honda cars are not generally that fast in the US, except for a few exceptions, Japan and other countries have been getting light weight high revving fun cars for a long time. The new US Civic Si is just a taste of what Honda has been doing for some time now. Not sure why the US doesn't get the good toys, but we don't. US guys buy a lot of used engines and do direct engine swaps. All it takes is a engine, ECU, wireing harness, driveshafts, and it's usually a good ideal to get the trans too.
I think a lot of it has to do with their inability to pass the stricker emissions testing in the US. Isn't that the reason why the 2zz-ge was discontinued?
If that were the case, then how could they sell the current Si? It's the fastest 4cyl US Honda ever. Honda, not counting Acura, cause I think the real Type R was the best 4cyl in the US ever.
I think Honda just sells slower cheaper cars because they sell so well. They have a economy market more then they have a sports market. Honda is making a killing in the US. Just a few years ago, they were still selling low end non vtec engines and people still bought those things up. We test drove one and it was so freaking slow.
If you want to tune a Corolla, go for it, but a Honda is still the better car to tune. Now, if TRD still had a SCer for 05+ cars, that might be different. I was expecting to have that option when we got ours. Toyota doesn't give two snips about aftermarket performance. I'm not even sure how much the engines can really put out, but without the support, you will be on your own.
I'd highly recommend a Honda if you want a NA 4cyl performance car. As predictable as it might be, you could be different by not installing a wing and fart can.