They are really all about the same bro. Not like Omega 3s that you have to watch the snook, hook, and crook sales for.
Also, get some high purity ginger root, that will help the stomach absorb more as well. No sense in eating a shit load if you are not absorbing and utilizing it.
You've got it backwards.....95% of fish oil comes from one distributor, Ocean Nutrition. Check the back of your fish oil container. Doesn't really matter who you get it from.
Probiotics do matter, to a degree. The lower end ones are mostly the same. But do yourself a favor and try out Natren Healthy Trinity. Buy it direct from the manufacturer, don't cheap out.... they'll ship it to you cold, next-day air. Great blend of probiotics but more importantly, the delivery system ensures it makes it deep into your gut.
Well worth the extra money..... it's the only probiotic that i noticed a difference with. Zero gas, even from drinking egg whites. Smaller bowl movements too, which i cant help but think that it means I'm assimilating more food.