Best wireless iOS pads?

I’ve narrowed it down to these 2 cheap units. I’m looking for wireless-midi-to-my-iPhone devices only, and I’m planning to use Koala sampler. I’ve been drumming for decades but this will be my first foray into FD. Which of these has the more sensitive, FD-friendly feel? Avatar EMP16 on top M-wave on bottom. Lmk opinions thanks!