Guineas are brilliant (mine tell me
)
Regarding breeds, I would stay away from the 'fancy' breeds (there used to be 3 types -smooths/Abbys and Peruvians- back in the day)
Now there are huge varieties of coat types but IMO the more Fancy the pig, the more they lose the original guinea-pig.
My DD is allergic to our Teddy and was allergic to our Rex (rashes) but fine with the smooths and Abby fur.
The Satin has a luminous coat , a more beautiful creature you will never find, but.....this beauty comes at a price, they are at risk of bone/joint problems.
The Skinny/Hairless (I was offered one, i declined it) needs to be kept indoors, warm, extra food, great care not to damage their skin. My hogs have most fun running through hay, the Skinny couldn't risk this 
The long haired pigs need a lot of care of the fur, I had a Peruvian years ago but kept her fur 'Floor Length' and combed daily.
Their cuddability varies from one to another, I don't think it's down to breed, just The Pig.
My Himmy is very precious, has to be protected from sun and claims (when it suits her) that she can't see things , like her cagemates so she stands on them. (Pink Eyes eyesight isn't as good)
You need to plan where they'll live. Indoors/Outdoors or both.
Have they got run space?
Garden run on the lawn
Have you got space for the hay and bedding?
I recycle all my loo-roll tubes in the shredder and aim to make enough shreddings for their bedding when they need less hay.
Hay can be quite allergenic too, check your DC are ok.
Rescues will have adults- bonded pairs, neutered males+ female groups and they might have piglets. Female piglets tend to get reserved quickly, but boars are lovely, very cuddly but need lots of space and consideration in their Terrible Teens.
We don't feed the piggies while we cuddle them, they have their chat and cuddle then have supper. (No wonder my pigs are so
at me
)