The HC9 is similar to the HC1, but with some of the HC1's features removed so that the HC9 costs less.
For instance, the HC9 - and its HC7 predecessor - have a manual focus option: to alter the focus you select 'Manual' by going to the relevant onscreen Menu item, then tap a region of the viewfinder screen to focus further away or closer, as described in
camcorderinfo..
On the HC1 you just push a switch beside the lens, then rotate the focus control ring around the lens ..in other words, you can instantly switch between auto and manual without hunting through onscreen menus, and you can focus -s-m-o-o-t-h-l-y- instead of in small, imprecise jumps.
Similarly, manual exposure can be instantly locked and released by a small switch beside the lens on the HC1.
The HC1 also has - like its big brother, massive FX1 - a facility to pre-set shots, like a change of focus and zoom from, say, a distant object to something close (..the top of the Eiffel Tower, to a little iPod in your hand..) then just activate that change of focus and zoom by tapping the monitor screen.
So there are lots of little details which differ ..but if you're unlikely to use those "semi-pro" features, then the HC9 is a better bargain. The HC9 also has "Smooth Slow Record - The Smooth Slow Record is a Sony-only feature that allows for three seconds of recording. This gets slowed down by a factor of four, to create a 12-second clip". The HC1 doesn't have that. The HC1 also loads tapes from the
bottom, not the top, so it has to be unclipped from a tripod for changing tapes. But it
does have a tilting eye-level viewfinder. The HC1 doesn't have an HDMI output (..for connecting to hi-def TVs..) only Component Out for hi-def and A/V Out. But my big-screen TV doesn't have an HDMI input, only a Component hi-def input ..so the HC1 suits me better than the HC9.
So ..mix and match the features you want, or don't want, and weigh up prices, and that'll help you decide whether the HC1 (..more "semi-pro"..) or HC9/HC7 (..shoot for fun..) may suit you better. I'd guess the HC9 is probably the one for you!