I agree with Nitro-Fish.
When I was looking for a compact utility tractor I also looked at the 3720 in the 3000 series, after much thought & my future plans for my acreage, I paid a little more & opted for the 4120 with 400CX FEL in the 4000 series.
It has a wider stronger frame, better hydraulic gpm, better loader lift capacity, bigger battery, bigger alternator, you get the picture.
It can handle the small jobs easily, but has the size for the bigger jobs.
It can also handle the bigger/wider attachments easier.
Just my thoughts!