A serger can be a useful specialist machine for repeated knit garment construction, but it does not replace every sewing-machine or coverstitch operation. The buying decision should start with the seams, edge finishes, elastic applications, and hems you make most often, then move to current documentation for differential feed, thread configurations, threading workflow, and garment-access
A first serger should be chosen around the work you expect to do and the complete threading routine you are willing to repeat, not around a vague beginner label. The useful comparison separates initial threading, rethreading, stitch conversion, differential-feed control, documentation, service access, and ongoing consumables. Air-assisted threading can reduce one part of that burden,
The best serger is not the machine with the longest feature list. It is the overlock system whose thread configurations, threading workflow, differential feed, edge-finishing options, documentation, and service route match the work you will actually repeat. Current home sergers range from relatively simple manual-threading machines to premium air-threading designs, and both can be sensible