My project is oriented to worldwide market. So I was searching for host which can offer multilocation hosting, found host1plus (have servers in six countries).
But please share advices in which country are better to host my project that speed for my visitors would be best. Or there is any other solutions?

In general, you could simply pick your main business destination (if any). However, most likely you won't feel a very significant speed difference on modern communication channels. Therefore, either US or EU server location would most probably suit your business.