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Every page says where the other product is the better choice. If none of them did, you should not trust any of them.
Syncro is the mature all-in-one with per-tech pricing. Atlas is younger, priced per user, and built around Australian billing, distribution and connectivity.
Atera prices per technician with unlimited endpoints. Atlas prices per user with every module included. The comparison is mostly about where your costs actually sit.
HaloPSA is deeply configurable and expects you to configure it. Atlas ships opinionated defaults and less surface to tune.
NinjaOne is a specialist RMM and endpoint management platform. Atlas is a broader MSP platform with RMM as one part of it.