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The 4500, I believe, has two license levels. The 3560X/3750X have 3 license levels.
When you're comparing performance, the 3xxxX series often has a problem of insufficient interface buffering, although this can sometimes be mitigated with configuration tuning.
Also the 4500 chassis has a fabric between line cards, while the 3750X series has a ring between stack members. Depending on your sup and line cards, the 4500E fabric can offer more and lower latency bandwidth.
So, for performance, the "right" 4500 would be a better choice. However, that's versus a 3750X stack, if you stack the newer 3650s or 3850s, their rings offer more bandwidth than a 3750X ring, and may surpass the 4500E, but interface buffering might still be an issue.
BTW, Leo is correct, a large enough 4500 chassis is less expensive than a 3750X stack although the breakeven point depends on software licensing and whether the 4500 is a redundant chassis with 2nd sup.
