RE: Flaxseed Oil
Depends on how much fat you're aiming to get in your cutting diet, what other sources of fats you're taking in and how much.
The oil itself may work out cheaper for you if you're going to be using quite a bit. But then again the caps may be much easier/convenient for you.
Like kerr I use the powdered form as I find it the easiest and most cost effective way to consume a good source of fats (and fibre) like flax.
What ratio of protein/carb/fat are you roughly aiming for in the diet?