There are certainly different opinions about this.
I've read quite a few complaints about inexpensive axle replacements failing. But of course, the OEM axles fail too, which is why people are replacing them with aftermarket in the first place.
So, every story is an anecdote - there is no statistical study concerning longevity.
My anecdote is that I replaced one 335xi front axle at 45K and the other at 60K with FEQ parts. Now at 80K miles with no problems.
I did the replacement myself with the car on jackstands - it is not a difficult job unless the axle shaft is a close fit, sometimes an issue with aftermarket parts. I recommend this inexpensive tool for safe, simple assembly:
https://www.ebay.com/itm/7Pc-Drive-S...97.m4902.l9144. Also, save the C-clip on the transmission side of the OEM shaft and replace the aftermarket clip with it - better fit.
If you are having a shop do the work, you are stuck taking their recommendation about replacement parts if you expect them to stand behind their work.