Most, if not all of us, like to trade predominantly from the short side; do you know why?
The real reason is not that it is easier or that Theta decay works for the position; even though those are all valid.
The real reason is because normally, when trading from the short side we have a better probability to win than when trading from the long side.
Any stock, ETF, or Index can only move in 5 different ways:
1. Fast up
2. Slowly up
3. Stagnant
4. Slowly down
5. Fast down.
When we are short, we win in 3 out of the 5 and possibly even on 4 of the 5; when we are long, we need the underlying to move otherwise we lose, so we only win in 1 out of the 5.

If only I would have known this two years ago!