x64dbg is pretty much good for most tasks. However we also have WinDbg, Visual Studio or IDA Pro's debugger or even Binary Ninja with Snare's Binjatron plugin that connects Binary Ninja to Voltron which itself is a front-end for a variety of debuggers (GDB, LLDB, WinDbg and VDB).
Furthermore you can check out Nanomite, BugDbg, FDBG, VisualDux, Evan's Debugger (EDB)
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http://code.google.com/p/edb-debugger/
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, WinAppDbg
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http://winappdbg.sourceforge.net/
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, Vivisect
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http://visi.kenshoto.com/viki/MainPage
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, etc and so on though none of them are probably as good.