I would say bench and horizontal flyes.
I do think db flyes is the best movement for chest development. At least in my case..
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I only train chest once or twice a month. My chest routine is either 1. Flat bench and incline dumbells press or 2. Incline bench and flat dumbell press...
I used to train it every 5 days... then once a week... then twice a week... then every two weeks... Ive noticed my chest grows faster the less i train it and sticking with only those two compound exercises.. I dont do any "isolation" excercises, if i did i would do cable cross overs just for the pump (for fun coz pumps feel cool) but i dont do any type of fly movement, its uncomfortable for my shoulders and hurts my chest tendons.
Incline bench and incline flies are my favs for the last 2 years or so. In my chest routine I have like 4 exercises, and prefer sometimes to superset a pressing with a fly exercise.
My current favourite "chest" exercises are the good old bench, band bench presses and pushups. Although I have been doing some heavier weighted dips recently and they rock too.
Isolated exercises are great for minor tweaking, however for those looking to make significant changes they are not ideal. Here are five reasons why isolation exercises may not be your best option.
1) Number Of Muscle Fibers Stimulated:
2) Reduced Time In The Gym:
3) Greatest Release Of Hormones:
4) Reduce The Risk Of Overtraining:
5) More Time To Focus On Other Aspects Of Your Fitness: