1:1 and vertical games on 4:3 monitor.. which aspect output is correct?

[edslp]

example 1 - Burger Time:
Original resolution is 240x240.. I can run at 720x720 and set aspect to 1:1.. or run at 960x720 and leave aspect at 4:3.

example 2 - 1942:
Original res is 224x256.. so its 672x768 (aspect 1:1) vs 896x768 (aspect 4:3)

Both options scale perfectly without filtering, though they differ in pixel width.. and I can't decide which looks right.. as one seems too wide (maybe) while other too thin 
Which one is correct?

[buttersoft]

I think you've stumbled on a case where it doesn't really matter.I'd probably pick the larger horizontal res as it might be slightly clearer. Like with super resolutions but not as much

Why are you not just using super resolutions, btw? It almost sounds like you're going to be creating a mode for each game you want to play.

[edslp]

thanks, yeh both options are perfectly sharp, it's just the pixel width that varies. I do use super resolutions also, which tends to pick an aspect closer to option B, but not exactly the same and I was trying to determine why.. but your right I will just stick to super resolutions in these cases

[Calamity]

I'm missing something here. Which orientation is your monitor?

[edslp]

Monitor orientation is horizontal. It's ok calamity, super resolutions are working well and look correct (btime = 2560x480 / 1942 = 2560x512).
I was just wondering why I couldn't reproduce the same correct scale using the options I mention in the first post.. I assumed one of them would be correct but it turns out neither are. All is well if just stick with super resolutions

[Calamity]

Ok, just for information.

The proper horizontal resolution to display a vertical game on a 4:3 horizontal monitor with the correct aspect ratio is 16/9 x height.

Example: 1942, 224x256 (256x224 vertical)
height: 224 -> 16/9 x 224 = 398,22 -> 400 (round to 8-multiple)

So the correct resolution is: 400x256
Or any multiple: 800x512, 1200x768, etc.

[edslp]

So that's the formula! Perfect, thanks calamity