Ok, so I tried bags today. decided to stick to bottles. I'm sure it's all in what you're used to. Found it a pain to fill the bags, and keep them closed. I know there are closer thingies, but glad I didn't invest in them. Too much cutting tips off bags, needing a third hand or cup for filling bags, keeping up with them upside down in cup while decorating with several colors,etc. I think it's harder on hands to squeeze the bottles, though. But I can also keep icing in bottles with lid for next decorating session.
Like you, I feel I have more control with the bottles. To me, they are great for flooding (larger bottles), and for lines and dots (smaller bottles with various tips.) For anything more complicated, like drop flowers, it seems like the bags are better because you can control the pressure. ( I have occasionally used the bottles with a leaf tip and a star tip, and it was ok.)
The trick with the bottles is to get the consistency just right. Also, a couple of suggestions:
If you store your icing in the bottle, you might find that it separates overnight. If that happens, you can use the fat end of a chopstick to stir it well.
While using the bottles, keep them upside down (I use a plastic container with a damp sponge in the bottom; it can hold several bottles at once.) Keeping them upside down will reduce air bubbles -- not eliminate them, unfortunately.