Nanopool is recommended in the mining community since it is a safe, fast site, with good technical support, it provides a wide variety of coins to carry out mining tasks. This site is only in the English language, it does not have a merged mining but it does allow you to create mining groups and share mining transaction fees with each other.
Its servers are located worldwide, as they are located in various countries making it a fairly fast mining platform, the interface is very good, it allows you to view its active miners, it has supervision and the margin of problems on the platform is quite minimal.