These answers will honestly change depending on who you ask. LE owners will tell you the answer is to buy the LE, no question. The Pro owners will dispute the differences aren't worth the extra money.
I love ALL of the extra features on the LE EXCEPT the colour-changing ramp lights. They don't do it for me. I much prefer the two-coloured EL wire solution as that colour combo suits the theme better, IMO.
I do respect that LE owners will always love their LE more, and from an investment standpoint they've all done very well. At this point though, new buyers have to justify the costs. And as others have pointed out, all mods BUT the EL wire can go on either game, so they shouldn't really be a factor when comparing the two.
As far as mods go, they're not for everyone.. and Tron seems to be the new TZ these days. That said, it's a theme that works VERY well with lighted mods. Speaker mods.. I'd have to say, I picked up a used Polk Audio powered sub for $60 and hooked it up. The game needed some extra bass punch for sure.