How does git-spice compare to git-town?

I haven't used git-town, but from a cursory look it appears to be a various collection of gitops improvements for day to day things, including some for stacking.

git-spice is specifically targeted to be useful for PR stacking and doesn't require you to do anything differently from normal git operations that you likely use already. It has a bunch of really nice flows and doesn't try to step outside the bounds of what is needed to easily stack PRs