H9 has great reverbs, including the Blackhole algorithm and a decent reverse verb, as well as a shipload of other cool effects.
Another genuinely studio-quality reverb pedal is the Neunaber Immerse.
Its W3T algorithm is breathtaking - downright hypnotic. Rich, alive, and incredibly 3D, even running in mono through a guitar amp.
Also offers hall, plate, spring, shimmer (octave-up in the tails), reverb + echo, reverb + detune, and a cool infinite-sustain mode.
And it has a remarkably compact footprint for what it does; the H9 takes up about three times as much space.
I have both on my ambient/fusion board.
When I want reverb, 90% of the time I'll hit the Immerse.
It's the black pedal to the left of the H9.