UB450 or UB820 for a projector setup?

I’m buying my first dedicated 4K player and currently stuck between the Panasonic UB450 and UB820. It’ll be used with a JMGO N3 Ultimate and a 120” screen.

The projector supports Dolby Vision, so the UB450 already covers what I need there and costs less. I’m still considering the UB820 because of the HDR Optimizer. Quite a few discs in my collection are HDR10, and I’ve seen a lot of projector owners say the optimizer is useful for those. Anybody have any experience with this? Mainly wondering whether the UB820 makes enough of a difference with HDR10 discs to justify the extra cost.