TBH with cats (if they're going to be outdoors) neutering/spaying is much more important than chipping because A) unneutered males are arseholes + likely to wander off and B) unneutered females will very quickly be popping out little clones.
It's the other way round with dogs really as they SHOULDN'T ever be unsupervised, so if they run off they need to be reunited with their owner quickly but also they shouldn't be able to get up to any funny business without their owners knowing about it
.
I think it's even a legal requirement for dogs to have a collar with tag these days? Though I personally don't recommend collars for outdoor cats as they can be a hazard to the cat.