ISP sits in the middle between regular data center proxies and real user addresses: it has as much trust as the latter, but speed and stability like the former. Below is how it differs from each format individually.

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Both formats are static and equally fast. The difference is in the origin of the address: IPv4 belongs to a data center, while ISP is issued by an internet provider and looks like a home address. Therefore, ISP passes where IPv4 hits checks — but it also costs more. If checks don't hinder the task, IPv4 will be cheaper at the same speed. The free 100% Uptime option is available for both formats.

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Both formats have addresses belonging to an internet provider, and both appear to the site as a real user connection. The difference is in permanence and payment: ISP is fixed to you and does not change, while Residential is a rotation from a shared pool of over 20 million addresses, and you pay for traffic, not the address. ISP is chosen when an unchanging address is important, Residential when coverage and IP change are important.

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IPv6 is significantly cheaper and has many addresses, but they belong to a data center and only work with sites that support IPv6 — and that's not all of them. ISP is more expensive but compatible with all resources and inspires more trust.

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Mobile is an address from a mobile operator, with even more trust, and the IP can be changed by link or timer. But it is more expensive than ISP, and the address does not remain constant. ISP is chosen when the address should not change.

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ISP is needed when three things are important at the same time: a permanent address, high trust from sites, and data center speed. If trust is not critical — take IPv4. If address change is needed — Mobile or Residential. If volume is needed cheaper — IPv6.