Ollydbg - Daily use
IDA Pro - Full analysis
Syser Kernel Debugger - Hard job

WinDbg is good for remote debbugging

olly64
 

Ne1 hear of plans for an olly x64? asked on olly.de but no answer...

tnx

Olly wasn't and will not be designed for 64bits, as discussed on the official support forum (woodmann's).
However it works for 32bits applications running on 64bits OS.

For a newbie, Windbg or Visual Studio are probably easier to use,
but once you understand the basics and want more, switch to Olly. It's probably not too user-friendly, but it's too much powerful!