Sorry about my sarcastic response, but the other two replies do provide very good, constructive advice. Think about the items rubenj mentioned that it depends on, as well as whether you will be flying economy or business; whether your priority is scoring upgrades, award travel or other goals; how many miles per year you anticipate traveling; and other issues that, as axepine00 suggested, you can find by searching through various discussions here. Then come back with that more specific information and you might get some good help here. Or perhaps the search itself will provide the answers. Or perhaps you'll find that, for you, it depends.