It’s interesting that aftermarket axles seem to have better rep nowadays, I’m also due for a set and will likely go with Napa axles as well.
I don't think that's the case. Despite a few folks here recently having experienced some poor crimps on the boots, the OEM axles are the only way to get guaranteed new splines. Aftermarket is a gamble. There hasn't been a trend of OEM axles problems until this thread (that I have seen, at least).
Boot clamps are a very easy and inexpensive fix (if caught in time). There is no fix for worn splines and they can leave you stranded if they finally give out.