Which is the best high speed charger for any android mobile?
well for using a high-speed charger your mobile phone should also have a support for it. the phone's hardware is very important in terms of usage of a high-speed charger or a quick charger. Qualcomm provides the hardware for the usage of the high-speed charger since there are some other devices such as Samsung's Galaxy S6 (Exynos) and ZenFone 2 (Intel) which supports high-speed charging since they have the license to use their technology.
using this website you can check if your phone's hardware supports the high-speed charging. you need to do more research if you didn't find your device there.
there is actually two generation of quick charging available that is quick charge 1.0 which was rolled out in mid-2013 and early 2014 and quick charge 2.0 which is the latest and faster than it's previous version.