the Myford became THE model engineeer's lathe largely because it was a (relatively) low cost machine in comparison with the better built Boxfords
The Boxford was not "better built" – larger capacity & heavier duty maybe, but both were mass produced items built to a price. The Myford would have been less expensive to produce for a number of reasons – innovative design & manufacturing methods for the time (& product ) being to the fore IMO. You may not like the use of die cast parts for some items, Hopper, but they would have required a not insubstantial investment that would only have made sense if large numbers were to be made. – and large numbers were made, many more than Boxford made.
There are good & less good parts of both designs – Boxford beds (Southbend derived) were only a milled finish & not readily available hardened, whereas the Myford was ground & was offered hardened. Myford beds are easier to recondition than Boxfords (who discontinued their bed re-maching service decades ago). But the Boxford A & B aprons have powered longitudinal feed via the rack saving the leadscrew for threading, unlike the Myford which uses the screw for both functions. Boxfords back gear seems more prone to problems than Myfords, but I don't think Boxford cross slides would be as bendy as the Super 7. Neither is perfect, both are capable of doing the job but with different limitations.
Over the last 40 years, while visiting many engineering companies through work, I regularly saw Myfords in toolrooms, one customer had several ML7-Rs run by women on production work & another started his business in his garden shed with a Super 7 – can't ever recall seeing a Boxford, though, other than the VSL that was in the fitting shop at Boxfords.
I had a CUD at the time I bought my Super 7, reasoning at being that I would sort both out & keep the one I prefered. The Boxford went. The Boxford was not a bad machine, I just prefered the Myford – partly for some more "user friendly" features, partly for the more readily available (and at the time cheaper) parts and accessories but mainly because I enjoyed using it more. The Myford cost me more than the Boxford, but for me it was worth it. For someone else it would probably be the other way round .
Norton Commandos? They were a POS when new and have only grown more obsolete with time.
50 years development would seem to have eradicated many of the shortcomings of the things & at least you can get most parts for them, unlike the original Z1. Not particularly interested in either, regardless of price.
Nigel B.