The more top of the range artificial trees are more time consuming to put up as the branches are individually numbered/colour coded. Whereas most trees bought from Argos, The Range etc are in 2-3 pieces. Plus the former take up more space when dismantled.
As an asthmatic I find the smell of real Christmas trees overpowering. Same applies for Christmasy scented candles etc which are pine scented. Also many of the spiced berry fragrance are not good. Though got a few Yankee Candles. Some Christmasy smells I have are Glittering Star and Christmas Morning Punch.
Fortunately, the relatives who had real Christmas trees are no longer around. When visiting friends and they have a real tree, I sit the furthest away from the tree or those who know about my asthma, we sit somewhere else.