Someone wants to trade a laptop that is running Windows 10 32-bit for your laptop that is running Windows 7 64-bit OS?
My issue with a Windows 10 laptop with 32-bit OS is that its likely that it only has 3GB or less RAM available and its probably also older than the laptop you already own so its probably a bad trade. A laptop with Windows 7 64-bit usually has 4GB or more RAM.
There is more to performance than a 32 or 64-bit OS. What make/model is your current computer and the one that is a refurb with Windows 10 32-bit?
Personally I would try to find a laptop that is Windows 10 64-bit, because the 32-bit Windows 10 sounds fishy as if its really old hardware and might not support more than 4GB RAM.