Wet trim without a doubt for me. The end product is more clean, with one part being just flowers and the other part being trims. You can use the trims to try other stuff (Cana VG for me), and smoke the flowers, because the taste of the flowers is much better than trim. I left some to be dry trimmed, to be honest I didn't trim them in the end. I end up removing the dry trim when crushing, which is annoying because i feel like i'm throwing so much out. It takes also much longer.
Hygrometer is very useful, with the temperature on it as well! 2/3 bucks for a simple hygrometer.