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No, the 4500-E isn't really "beefier" than a 6500-E, but to maximize the 6500's performance you need to carefully select components.
Either can be a good core device. The 4500 series should be less expensive. If you use a 6500-E, and you've been using 6500s, you can reuse other components, but again, you need to be careful what you use if you want maximum performance.
For a core device, instead of a 6500, you should consider a 6807 or 6880.
For a core device, you might also want to consider the 4500-X.
