I use the following for QSL exchange/Loggin

eQSL.cc – Automatically updated using HRD Logger.

ARRL Logbook of the World (LoTW) – Uploaded monthly

QRZ.com – Please note that I rarely log using QRZ. I do confirm.
If the HRD software gets updated to include logging VIA QRZ.com
then I will start using it

HRD Log – Automatically sent using HRD

Direct – If you send a card to my P.O Box I will reply with one. NO SASE needed. If you spent the money to send your card it’s only fair that I reply using my own postage.
At the moment I do not have any cards. That will change once I receive one.