I tend to stick to PostScript compatible printers because it is the only real way to ensure interoperability.

Buying a printer with a proprietary page description language is just asking for trouble. From the retrocomputing perspective, you simply won't find support for your old computers (in most cases). There is also the potential that it won't work on your future computers (may you change platforms, or the driver break on a new release of your OS). And for me, that's important since my printers tend to run a long time. As an example, my family bought an NEC Silentwriter2 Model 90 in 1992 and we retired our second one in 2005 (give or take a year).