honestly you should be spending your own money to figure this out, but here's some free info anyway:
few years ago I launched 3 copies of a new/custom script on three domains. Two of them .com, with not-particularly-brandable names. One of them on a .co, with a VERY brandable name.
Did all the same SEO to all three.
The .coms did much better than the .co...even though the .co was a premium domain name and the .coms were mediocre at best.
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