My lot also get tuna bread, cheese, apple etc. as treats but biscuit wise I just did a quick recce in their biscuit cupboard and we've got JWB Crackerjacks, Healthy Paws fruit cookies, Fish4Dogs fish skin square things, Feelwells probiotic biscuits and a few packets of Fish4Dogs Stars and Nature's Menu chicken treats and the rest is basically crap

Gravy Bones, a box of Bonios and PAH puppy mini bones and marrowbone biscuits which Rodaidh loves. Chews I order in bulk from Zooplus, they like the venison and ostrich stuff and the odd Antos hedgehog.
Tbh I don't worry too much about the biscuits they get, they don't get loads of them and I rotate the good and not so good ones so they might only get a couple of Gravy Bones a day and a Bonio once or twice a week, they like them and at those quantities I don't really worry about it too much. If you want something decent quality though I'd really recommend the Fish4Dogs stuff, they all love it and the Crackerjacks go down well too although I am going through fewer treats just now as Tilly isn't allowed them, she can only have her d/d kibble.