Realistically you cannot be too picky on a set tree. Saddle hunting is designed around being mobile for a reason. For example, I try to sit hard woods with a good back drop to break up my outline. I hate sitting pines due to sap and noise. BUT, last year, the only tree available for my set up which would put me into position to kill the buck that I did, was a 6" round runny white pine. When I was at hunting height the tree would shake and flex, not to mention bleed sap like crazy. I closed the deal Nov 6th and was holding the 131" ten pointer I was after. Use your equipment to close the deal. Find what works for the scenario and get your practice in. Conditions, more often than not, will not be in your favor.
Scenario #2. My 7 point with my bow during early season. I had a tree picked out, went in and climbed, hated it. Climbed two more, hated them. Finally settled on the 4th tree with 2 hours left and scent everywhere. Played the wind, had minimal shooting lanes and was very uncomfortable. Faith was at an all time low. I knew what the buck had been doing, set up, killed him an hour into my sit. I was in a skinny maple with a very uncomfortable lean and limbs in not so good places.
Hope this helps.