@wedemars It depends on what your goals are for working out. Clearly one of your goals is strength (since you want to lift heavier.
Is general health also a goal? If so, both your college weight and current weight are within a healthy range. People like to hate on BMI because of the extreme outliers of competitive bodybuilders, but it's still a useful metric. It's a big range and either way both those weights are healthy.
It sounds like aesthetics is also a goal, right? Here's the thing about that: weight trends change a lot. Right now bigger bodies are kind of in style, but that trend will go away in favor of thinner bodies again and then back up, etc. Keep in mind that right now, in a lot of places around the world (not sure if you're American, but this applies elsewhere as well) most people are overweight (outside the healthiest range). So don't compare yourself to other people, or healthy may seem too skinny. Honestly, focusing on being healthy is likely going to keep you at your most attractive.
How do you know which weight is *more* healthy (again, both are in the healthy range)? Base that on how your body has felt (*not looked*) at each weight. Do you tend to have more energy at one weight compared to the other? Does one weight give you more stamina?