I'm email only for new inquiries, as I'd much rather receive complete inquiries with full sentences that start a conversation, than the 'hey bb, you avail now' that generally come from texts.
For discretion, I also don't respond to texts if I'm more than an hour late to get to them, which can pose a problem, especially when traveling, or driving across nl, for example
I find email inquiries more simple to screen, and easier to assess the personality contacting me, than texts.
Just my experience