Ok, I was reading the many posts and wondered if for pasture raising if there is a certain breed or cross that does better than the others.
YES! SO the simple answer is YES but the more complicated answer is that just as with cows, some of the breeds have had the grass genetics bred out of them

These animals cannot thrive anymore on grass which IMO is very sad. If you are wanting to raise pigs on pasture it is absolutely imperative that you purchase your stock from someone that is already doing it. It is not only the breed that will make the difference but also how they are being raised.
For example - we raise Large Blacks here. They are pastured 24/7. They do get some grain/eggs/milk supplementation (a pig has a single stomach like we do) but nowhere near the amount a commercial. confined pig would eat. However not all Large Blacks are raised the same. When we move ours to fresh pasture they are SO excited & go to chowing down on the grass immediately but I have noticed that other Large Blacks do not do that. One time we brought two in here & they looked at the grass as if to say "What is that?!"
You also need to research on how much rooting they do. if you go to the farm & see the grass all torn up you do not want those pigs. Large Blacks do not root very much - you can walk our pastures without tripping in holes & mud! A cross breed will grow faster but you need to make sure you purchase the right cross. Most pastured pigs are heritage pigs. They take longer to mature to butcher weight so whereas a commercial hog is ready to be butchered in 6mths , a Large Black can take 10-14mths to reach the same weight but you will have a much healthier meat at the end. The heritage breeds tend to have darker meat - more flavorsome. It is definitely NOT your 'other white meat.' LB meat is nearly as dark as beef.
Breeds I would recommend:
Large Blacks
Red Wattles
Gloucestershire Old Spots
Be prepared to pay more for the piglets. They are not normally as cheap as a commercial hog.
Liz