They didn't "choose" to compare this one to the Viewsonic VX2758-2KP-MHD. They reviewed that Viewsonic monitor previously and obviously they can only compare monitors they have measured in the studio. If you want them to review the Viewsonic XG2703-GS, then become a Patreon member of Hardware Unboxed and suggest it to them.I found this comparison unhelpful. The reviewers failure to include the Viewsonic XG2703-GS that is based on the same panel as the reviewed monitor, and instead choosing a LOWER SPEC Viewsonic monitor is BAD FORM! The Viewsonic XG2703-GS matches specs exactly to the TUF Gaming VG27AQ as a 27" 1440p 165hz IPS/AHVA panel with the only difference being hardware Gsync included with the XG2703-GS and the cost of the Viewsonic XG being somewhat prohibitive (the XG is stupidly expensive) but does match specs.
The LG 83a is definitely worth looking at as well. Main difference is the wider color gamut, but the 83a is 100% sRGB which is fine for most gamers unless they do photo editing. I got mine for $320 on black friday. Normally about $380.The LG is really really good and worth the extra money. First hand with it after a while now.