My thought is the smaller one, but what I recommend is that you take painter's tape and mark out each of the options on the wall (take picture, so you can compare). That should help you decide which one YOU prefer.

Can we see a photo of the credenza and wall? Also, it might help you if you take a photo straight on and photoshop different sizes onto it

Great idea about the painters tape! I also will photo shop the different sizes. Another excellent idea!

I didn’t post a photo because it distorts the actual dimensions so much.

You could google the advice, as did I:

"The general rule of thumb we use is that artwork should be about 75% of the width of the furniture, and this applies to a single piece of art or a grouping.

Go with 32.25" for the art. The height of the ceiling isn't involved. You choose your art and hang it at eye level.

Here you go, but please keep in mind that when you’re standing next to credenza, it is not lost on the wall as it appears in the photo. And I’m a minimalist at heart. But if you have some minimalistic ideas to make the credenza look not so lonely, I’d love to hear them.
Second part of hallway has two contemporary etageres. Please ignore ladder. Oils line the rest of the walls.

Blue tape outlines size of a gorgeous painting we found to put above the credenza. Does it fit?

Getting rid of the credenza is not an option. This foyer has been frustrating me for a long time.

Thank you so much!

Please be gentle!

Must add that tall painting guides your eyes upward to notice exotic chandelier that my DH chose.