Been my experience they have fewer ticks than Deer. Probably because they take mud baths, Ticks need to breath.

I wash mine down with an old steam Jenny I have, then I refrigerate them shortly after shooting them. Most of the external parasites abandon ship when the host is dead and cold, if you don't have access to boiling water.

Internal parasites are always a concern, avoid gut shooting them. Field dress them as cleanly as possible. I don't eat any red (under cooked) meat from Wild Hogs, I make sure they have been cooked well.

Old Boars stink (I believe it is a hormone thing), under two year old Sows usually don't. Especially if they have been eating well. I harvest my freezer meat in the fall when the Farmers are harvesting their grain. Most of those wild pigs have been eating better than I do. They can get a gamy taste when they are eating winter forage, I can taste the Acorns. I always supposed it was the Tannin in the nuts.

I prefer Wild Hog meat over Deer meat generally. Most of the Deer I've eaten have been Mule Deer out of the South West, they eat a lot of Sage and can get a strong taste. The Roe deer they have here generally eat really well (like the Wild Boar) and IMO are better than Beef.

In other words a lot depends on what the Hogs have been eating.