'93 Ibanez RG550CA v. '01 Ibanez RG450DX (MIJ)
So this has been killing me. I have two RGs, and any more than one, in my case, is vanity. Both are Fujigen-made, both stay in tune, both play well, both sound practically identical. The 550 is worn a little heavier than the 450, but other than color, neck profile and a 'better' tremolo - though the MIJ LO-TRS holds up just fine - it's the same guitar.
So, for the sake of novelty, I'll let the internet decide. Let me know what you think, Jemsite.
Edit: To be fair, the 450 does play a little better. The difference is slight, but there.