Barbara Mason's "Oh How It Hurts" LP

[Agent45]

Has anyone ever done a side by side comparison of Mono v. Stereo for the "Oh How It Hurts" LP? I've had a Mono promo for years, but recently acquired a sealed Stereo copy and I'm trying to figure out which to keep. If I keep the Stereo I'll break the seal but if I sell that one, I'd rather sell it sealed. Ideally I'd prefer to keep the copy that sounds better. Which one would fetch more money is not in the equation. 

[Garethx]

Mono.