That's a tall order.
"land anywhere" would restrict you to a small ship. Small ships are small, so your profits in cargo or passenger runs will be restricted.
Apart from that, the best general purpose ships are probably:
- small: Cobra Mk. V
- medium: Corsair
- lange: Cutter, with the Anaconda as follow-up, until the Panther Clipper is released
The release of the new generation of ships has definitely upped the stakes, it's become very hard for the old style ships to compete against that. If you try them, don't start with the CMV, she will spoil you for all other ships.