Nice ! But I'm going to plead for mercy for the smaller one. Sometimes, the one which starts slowest grows the strongest in the long run.

Instead of killing it, nurture it and repot it until it's as big as you are able to look after. Then find somewhere to plant it where it can grow and flourish. Perhaps deep in a secret sunny patch in a nearby wood, or as a gift for a friend buying their first house with a garden big enough for a pear tree (with the promise that they'll make you a pear crumble each year as a gesture of thanks).

Our cherry tree came from something like this.

The first month after buying our house, we went to look at some furniture for it. The furniture was awful, but the industrial estate had a row of old cherry trees. I picked one, ate it, dropped the stone in the car's drink holder and forgot about it for a while. Then I remembered it, put it in a flowerpot in the greenhouse and forgot it again. In the spring, it made two leaves. So I watered it, re-potted it when it got too big, and again when it outgrew that one.

Finally I put it in the ground, and now it's a beautiful 40 feet high tree full of birds and bees. With amazing blossoms every spring.