Park is going to be better at Winterpark. No doubt about that.
Loveland is a great mountain. The real drawback for an out of stater is that there is no nearby lodging to the ski area. So in that regard Winterpark is going to be a better place to stay.
You could stay in Idaho Springs, have a few decent bars and places to eat and about a 20 (maybe less)minute drive to Loveland though.
Loveland is also probably about an hour from Winterpark. Maybe more like 45 minutes. A pretty quick drive.
Winterpark does have a lot more terrain but it may mean nothing depending on your dates. The 1st-4th of what month would help. If it's November, you better just go to Loveland, I don't think Winterpark is open yet at that time. December, it's a coin flip, January, you should see a lot of terrain open at both resorts. In Feb, most areas will be 100% open, etc.
Winterpark is my personal favorite in the Front Range for several reasons. Most of which is that it suits my style of riding. Loveland is in the top 3 of that list though for sure. I've had a ton of fun there over the years.