Tempted by Black Friday sales, I was shopping for a budget PRS optic, looking at the first two (but know nothing of Arken). Hoping to eventually take a long-range precision course, I figured I'd talk to an instructor. With no prior interactions, I just called [EDIT: removing the source who is a well known CAD instructor] this morning asking about the two mentioned above. His take: "Stay away from Vortex. I've never seen one of their scopes make it all the way through a course." Based on his experience, he recommends saving up for a Leupold Mark 4, but also had decent experiences with Bushnell, specifically the Elite Tactical lineup. Now, don't misunderstand the context... for average range days, or typical hunting use, Vortex scopes probably work great. (I appreciate my Vortex binos.) But LR courses test the limits of an optic.
His best piece of advice (my paraphrase): North Americans have it backwards: They splurge on expensive rifles and chassis, and then slap a budget optic on it. With a limited budget, it should be reversed. The glass is what will allow you to shoot at distances accurately and consistently.
NOTE: I did not get his permission to quote him or share, so I removed his name and website.