My opinion is that the best machine is the one that does the job its user wants done and has the best, clearest maker manual use and care information as well as ongoing maker support. AND LASTLY BUT EXQUISITELY IMPORTANT, a service tech close to home.
This next paragraph is offered to support my opininatedness: I currently own an assortment of 6 sewing machines from my grandmother's Singer 66 through my father's last gift to me, a Husqvarna Designer Diamond Royale. I also own a Singer serger Merritt 14u44 and a Huskylock 936 serger. Yeah, kinda from historic-ish alpha to current omega-ish omega. A total of 8 and all of them work and get used. If I can, I do the servicing. If not, they get a kiss on the forehead, a pat on the fanny, and a trip to the service person. Only one of them has passed on - an Elna Super that I actually wore out; used beyoned repair.
Should I ever need a machine, I will be applying for your advice and support. Thank you for being there.
Pat