Original sentence: Additionally, IS-IS is neutral regarding the type of network addresses for which it can route.Given the same set of resources, IS-IS can support more routers in an area than OSPF.OSPF, on the other hand, was designed for IPv4.This makes IS-IS favoured in ISP environments
Edited sentence: Additionally, IS-IS is much more neutral regarding the type of network addresses for which it can route.OSPF, on the other hand, was very much built with IPv4 in mind.This makes IS-IS ideal in amongst others ISP environments.While OSPF only supports 50 routers in a single area, IS-IS can support up to one thousand routers per area