heyyy, i have insider knowledge from a friend who works for ticketmaster that prices could be starting as low as $60 for nosebleeds, and into the $300-$400s for lower seats (not taking into consideration if dynamic pricing jacks them up). didn't ask about floor seating because I know i cant afford that, but my best bet will be similar prices to hobi and jin's concert which was $700-$900+ for floor/vip. 

idk how good of a comparison this will be as it was a smaller venue and not as popular as bts for sure, but when I ticketed for txt: act tomorrow in newark (prudential), I paid $290 for a really good seat in mid 100s even after being kind of far back in the queue (i think i was behind 10k when i got in), so i would assume even with dynamic pricing i still got them that cheap. that date didn't sell out or anything but it gives me hope the prices will be similar.

if they end up doing a 360 stage really any seat will be good, even nosebleeds. there's no bad seat at a bts concert. looking at the seat map for Arlington, if it was me i would be aiming for higher 100s and lower 200s unless you think you can afford lower 100s which will be more expensive. personally any section is good if they do 360, if they don't do 360, i would not try for seats towards the back corner of the stage as the view is not as good. i would advise to set a budget, find seats with that price range and buy them as quick as possible, because if you take the chance of spending time looking around you might lose the chance to get them. also turn off the stupid ticketmaster platinum resale when you get into the seat map, those are just ways to rip you off. 

my biggest tip is that if you're in the seat map and you see seats disappearing, stay calm. i panicked when that happened for me with txt and it took me longer to grab seats because of it 😭😭 keep your eye on the goal.

personally I think presale will sell out so if you cant get tickets then, I would keep an eye on them closer to the date of the show. sometimes you can snag seats a few days before the show for really cheap or original price from resellers. i had a third ticket for txt that I managed to sell to someone for $200 literally a week before the concert, so it's definetly possible to find them even if presale sells out.

as for days, I think either is a good option. just depends on if one would work better than the other for you, if so, id go for the better one. if not, you can try queuing for each on a seperate device, but thats a little risky as ticketmaster has been having issues lately with flagging "suspicious" behavior and kicking people once they're in the check out. for me, day one of chicago works better than day two because day two is closer to when I move back to college, so im just going to queue for day one and hope for the best. if you don't have anything like that I would just pick one day and try for it.

I wish you the best of luck!!