I have two phasers, and will probably get a third.
1) is a DIY pedal baser om the Musikding Phaser kit, which is a phase 90 clone. I have modded and externalized controls. It now has the following controls: Speed, Depth, Blend, Trim and a feedback switch. This makes me able to dial in a wide range of sounds. It is, however rather large. I use it mostly for guitar these days.
2) is a Moore Orange Ninety, which obviously is based on phase 90. It has a classic/modern switch which I suspect to emulate both the new MXR and the old script version. It sounds great, but is rather subtle on both settings. It lives permanently on my bass pedal board.
3) is not a dedicated phase pedal, but I want to mention this: I love my Zoom MS-60B. But I do not like the phaser effect in it. Far too pronounced, no depth knob, and it has a pronounced "whoosh" sound that is not so present in my dedicated phase pedals. I sometimes use it, but to be honest, I find it to be no more than a backup solution.
I am almost sure I'll get an EHX Small Stone Nano. I find the demos and reviews convincing, and being a Phaser addict, I want to expand my palette with this.
PS. I am such a phaser addict that I almost never use chorus, even if that seems to be more common on bass. And don't mention the flanger. The woshing sound makes me go nuts.