I put in a green last year and it is right next to trees. I live in Cincinnati Ohio and we had a super wet first half of the year and then we had desert heat since then - just got out of the 90's today. After 1 year in, the turf is no different than day 1. It is infilled with Envirofill and I had to add more this spring. Pine Needles are a killer - they are hard to blow off of there. I imagine sap would be the worst, but that would mean a pine tree was on top of the green. I would keep the green away from pine trees. My douglas fir is too close and I pay when it drops needles.
The green shown was about $12k, and I added the light turf myself. Got the turf from Amazon supplier and then had to haul 6+ ton of gravel for the base - then infill that with silica sand. I also have another bunker in the trees with regular sand in it. I have a mat that I hit into a net that I built the frame and can hit from the mat to the green or hit from anywhere in the yard.
My green turf is a better putting surface which means it is not easy to hold a shot on it. It is about 35' at its longest width.
It is a lot of work blowing leaves and tree crap off but I do that 4-5 times a week. I use the hell out of it and love it. I would go a little bigger if I ever did it again, and make sure you get contours in there - I love the ones that I had put in mine.
If you have any specific questions, ask away. I used Tour Greens Ohio and they were outstanding to work with.
If you go real grass you have to mow all the time, have a mower and deal with disease - it would not be any fun - I spend 10 minutes with a cordless leaf blower and I am golden (if leaves are dropping).
The type of turf matters as well - some types are no appropriate for areas with more humidity (like where I live).