I got both..
Handling: TSX has much better handling, I can't seem to get my accord to feel like a TSX, got HR springs, tokico shocks strut/sway bars... still doesn't feel anything close to a TSX.
MPG: The old Accord runs on regular, the new accord (7th gen) runs better with higher octane. I get about 27 MPG with the TSX, about 25 with the Accord
Lights: HID vs No HID. Yes, I like to blind people
Speed: Accord are faster, good luck trying to find a 6 speed v6 on the coupes, not every dealer has one. Faster = worse MPG.. so take your pick. TSX has optional comptech supercharger - its on comptech's site. Its in the final phase of development. TSX also has Hondata, giving it +29 hp & +256 ft/lb of torque. Hondata may release kpro engine management and then it's all over.. there are also performance cams and better after market junk for the tsx. I think the TSX lacks torque big time.. I like the feel of the accord's torque better. I believe C&D got 0-60 on tsx at 6.5, so it depends on the driver
http://www.hondata.com/reflash_tsx.html
'05 version are not out yet but 05 supposely gets higher HP with hondata but thats not confirm yet..
Size: accord - large (sits 5 great) and tsx - smaller (sits 4 great). Accord has bigger trunk space, tsx doesn't
Interior - similar, i got nav on tsx and no nav on accord
Cup holder - accord has like 8, tsx has 2
My snow tires from accord fits my tsx
