In your opinion, what is the highest-quality and longest-lasting vape pen on the market right now that can be used with both wax and herb? Price is not an issue as I feel I'd be most content with spending a one-time large sum if need be. Thanks in advance.
No pen can do both effectively as PH has said, but if you're looking for a portable vape that can do both rather well the da vinci ascent would be your best bet.
If you're looking for a pen vape I'd suggest buying a generic 510 battery, I have a Vision Spinner II, then buying separate attachments for dry herb and wax. As others said no dry herb pen is going to vape your material, it will only combust like your smoking a pipe. For a portable dry herb vape you'd have to step up to the Arizer Solo or the Pax.
Of course there are other options that will get the job done, those are just the two I've had experience with and can personally recommend.