I’m with
@macjaffa on this one. At least privately, I mostly (but not exclusively) use iMessage since it works fine for what I use it for, short messages. Emojis instead of reactions and low res pics works fine too.
It is convenient and universal, even if the functionality may be limited depending on what the other end supports. Also, as
@macjaffa pointed out, some services inly work with SMS.
Occasionally I use Messenger to stay in touch with few relatives since that is their preferred way of communication.
At corporate level I use MS Teams to communicate with my colleagues.