That's about as ambiguous of a question as "what's the best protein powder". The majority of fish oil products are good to go. Some differences lie in EPA concentrations, with some products boasting a higher EPA count per 1000mg of fish oil. Although quality is always a concern, cost effectiveness comes into factor here playing a major role. Last time I checked, Nutraplanet offered a whopping 1000 caps for $25. You're fortunate to find 1/3 of that size for the same price in retail.