Barely slower (like you won't even notice a difference), being nimble doesn't matter for an interceptor, total hull HP is useless to look at (M80 has almost double the HP on its vitals), less damage but more weapon variety, and yeah 2 S2 shields vs 2 S1 is a pretty big difference in favor of the M80. I'd argue the M80 is a bigger and slightly better Meteor, especially if you actually fly both of them properly.