What proxies are you mainly using for price monitoring these days?

I’m currently monitoring prices and inventory on a few e-commerce sites and want to check what the common choices are right now.
A few questions:
1.Residential, ISP, or mobile — which do you use most in practice?
2.What success rate do you generally consider acceptable?
3.Have you ever seen a provider suddenly suffer a large drop in success rate?
4.Any setups that are particularly easy to integrate?
I’m currently using Helodata and would like to compare real-world experiences. Anyone with experience, feel free to share. Thanks.