My friend has a Patterdale, lovely little dog, daft as a brush, boundless energy and very friendly. I don’t like border terriers as much, don’t know why really, a few neighbours in the street have them and they’re just a bit common and samey.
The patterjacks look like lovely dogs, I’d be looking at them if in market for a new one.
FWIW I have a Parsons Russell, great fun little dog, like a jack R but bigger and not as nippy. We did cut his balls off mind after he growled at one of the weans. He’ll run all day with the bike and everyone who meets him loves him.