I prefer LoTW, however I also have QRZ.com and e-QSL. Here's a page containing some QSL cards I've received and some POTA stats.
I have now printed some of my own QSL cards. I'll respond to all physical QSL cards with my own QSL card.
A QSL CARD from K6DF
Here is a QSL Card from KD4UTL.
A QSL Card from W6BSD.
Here is one from W6P obtained from the SFARC OTA-Trifecta event in 2023.
Here is one from N6LRC