Better to use an account migrated from old eMac, or start with a clean new one?

I just installed Leopard on an Intel Imac. My previous computer was an eMac with 10.4.

I have two main accounts on the Imac. One is the administrator account from when I installed Leopard. The other is an account that I transferred from a backup of the Emac, using Migration Assistant. Which one am I better off using? Should I move stuff into the clean new account, or use the migrated one and just clear out anything I don't need anymore?

I ask this because I'm wondering if the account that I migrated over is going to have stuff in it that slows things down or causes problems. I thought that slowdown type stuff doesn't happen with Macs, but then I've read that it does sometimes, so I'm confused. Are there any drawbacks to using the old, cluttered account?

JustGretchen said:

If the emac user has old classic apps or stuff like that it wont work, so I'd say starting fresh is the best way to go.

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I don't have any Classic apps that I use, but I do have a bunch of software going back to 10.3.