Hi, I currently own both phones.
I have a Lumia 930 as a personal phone and a Lumia 650 for work.
The Lumia 930 was released in 2014 and as such is no longer sold by Microsoft, although you may be able to get a new 930 from resellers.
The main downside for the 930 is the battery. I need to keep a charger handy at home and in work to keep it charged up.
The 650 though stays charged all day with ease.
Camera is great on the 930 (even running Windows 10 mobile), though I haven't used the 650's camera a great deal.
If you can get a 930 at a good price, go for it.
Otherwise the 650 (being a newer phone) would probably be more advisable to buy.
If you need additional help or have more questions or details to share, please join the site so you can reply in this thread. See
this link for instructions on how to join Windows Central.