What is the difference between wall mounted and under sink water purifier?

What is the difference between wall mounted and under sink water purifier
Under-sink RO water purifiers are the new generation of water purifiers in India and are the latest and most effective type of home water purifiers in India. Here are the reasons why under-sink or under-counter RO water purifiers are better than ordinary wall-mounted or counter-top RO water purifiers:

Indian kitchens are becoming trendy with latest kitchen cabinets built in counter top and kitchen sink. Keeping this modernization of the Indian kitchen in mind, we should use under-the-counter or under-sink water purifiers designed for use with built-in sinks in our modern kitchens. Under-sink RO water purifiers are better than wall-mounted or counter-top RO water purifiers built into kitchen cabinets and sinks.

https://www.cleanjal.com/what-is-the-difference-between-wall-mounted-and-under-sink-water-purifier/