Hi Irish Photographer. Welcome to the forum. There is a lot of experience and good advice on here as well as some Fred Drift as discussions wander off topic. It’s all part of the fun.
Anyway, as far as your Caravan choice is concerned, then there is no model that is fault free. Personally I would have a Sprite over an Elddis any day- indeed we did exactly that. However Swifts have their faults. The cracking of the panoramic window is well known. Whichever van you choose make sure it has a good warranty and in the case of a Swift that the warranty covers the panoramic window ( if buying new the Swift warranty covers it as part of the 6 year water ingress cover).
Also, I don’t know if you are viewing these vans “in the flesh”. Please do. Take the kids, the nappy changing bag and a picnic and have a family day out touring as many dealerships as you can. Get into a lot of different vans and actually get the kids to try the bunks; think about where your stuff will go; check that there is enough room in the bathroom to shower a child who needs help etc etc.
It is great fun but make no decisions until you can go back without the kids to hammer out a deal.
Happy Hunting and Good luck
Mel