You sure your panel is IPS? I haven't checked in the last six months but I'm pretty sure all the Dell gSync monitors sold are TN panels - I bought one last year and like it, but hope to upgrade to a 144hz HDR gSync 2560 or 4k panel next year.
The omen is a nice monitor but its freesync not gsync. Gsync tax seems high always but it is better than basic freesync if you have an nvidia card, AMD of course freesync is better. Next year should be interesting, HDMI 2.1 is approved and has as a feature Variable Refresh Rate which is basically gsync/freesync over HDMI. Nvidia however lobbied for Displayport 2.1 to NOT include that, so its going to be over HDMI but not DP. I have no idea whats going to happen with monitors, whether they will all go HDMI 2.1/VRR or we will continue to have FreeSync, gSync, and now VRR models of monitors.