Well Kubota owns land pride now, so that partially explains the price difference. Kubota's kit is a land pride kit to the best of my knowledge. Have put several on. They work great and I've never had one back for a problem that wasn't either installer induced or end-user induced---both usually due to wiring. It's a good kit. If you have a backhoe on it, you'll have to get creative with the hoses as the instructions don't specifically tell you how to do it with a backhoe. They have the resources to re-print the instructions but for some reason they don't. Sometimes it's the little stuff like that, it just makes me shake my head and say to myself what are they thinking.
You will likely need to have 2 hoses made if you use the LP or Kubota kit, unless they finally got smart & are sending the correct length hoses. We have used the Kubota/LP 3rd function kit, with an Agrisource grapple-and they work excellent together.