One old and not easily sold due to cosmetic blemishes, but quite good, the other pretty mint and lovely, also good, but I could sell for similar to the purchase price if not a little more.
So it is the 2 similar guitars problem.
I definitely would keep my one electric, one nylon and one steel string.
You can go analytical: list reasons to keep it (like it is from a more renowned brand) and reasons to get rid of it (like it is harder to play) for each one. Or you can list factors than one or the other would make it the best guitar for you and give weights to each factor and then provide scores for each factor for each guitar and compute the weighted score.