>>325944478
They're all about the same, give or take.
Index and Reverb have a little more, O+ and the Quest are about median, Rift and Vive a little less. Pimax has the most by far, but it's a dumpster fire of a headset that you should avoid.
Wear the headset with the lenses as close to your face as possible. If you use glasses, try getting prescription inserts for your hmd instead of wearing glasses in it. There's some simple mods for the O+ that use straps or elastic to flex the visor closer to your face, you can probably find the guides on plebbit or google - other HMDs like the Index have a dial to adjust distance from the face for the same effect.