I found this board very attractive, with 4MB, and 9+ I/O. For a good price.
I wanna to use Sonoff basic (as is) for relays, and Wemos D1 R2 for fancy sensors (direct, 1Wire, I2C).
I don't like to extend Sonoff with external sensors, For risk of electric shocks.
And, of course, Tasmota on all board :).
m.s.