Suggestions for what motor to use for my minisumo robot?

So, I’m building sumo robot for my robotics class, but I need some motors, I was thinking on getting the Polulu’s N20’s but then I also found that some of my classmates are using Fingertech’s Silverspark! I’m not really sure on what motor to get, as I’m also on a tight budget and getting the snlversparks would be quite expensive as I would need to import it! Any suggestions? (Oh, the robot has the following regulations, it needs to be 500 grams max, and needs to be under the 10×10 cm of size)

submitted by /u/RyuNeko932000
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