I test drove both Accords (I4s and V6s) and TSXs (I4s) and bought an Accord 4 Dr V6 6MT. I would not have bought either with an AT.
My Accord has gone almost 160,000 Km and has been reasonably reliable. The first transmission was replaced after only 1500 km because it regularly kicked out of first and second gear under light deceleration. The new transmission is better but it will sometimes kick out of first gear if you're going very slowly down a very steep hill. It's done it a half dozen times, mostly when it was new. It shouldn't do it, but it does and Honda has been of no help. So I no longer go slowly down very steep hills in first gear.
I have had to replace the windshield (hit by a rock right in front of driver's seat), the rear pads and discs, and changed fluids, filters and tires. I changed the timing belt early as I was driving regularly in an area with very low temperatures. After 10 years the car still looks and runs like new.
The TSX is the "World" Accord, but fitted up a little better for the North American market. I don't remember there being much of a price difference. I have no idea which one was more expensive.
I'm still a bit sorry I didn't buy a TSX. At the time I was driving in fast and heavy traffic and having a slightly bigger car must have appealed.
If you can find either one in good shape with a manual transmission, it might be a gem.
PS I'd buy either one again.