If you are not that committed yet to subjects or to how you will use your photos, then I would suggest approaching photography in stages, and starting at one of the lower stages rather than near the top. Buy the used 7D or a current Rebel with the kit lens. Today's basic DSLRs and their kit lenses are truly amazing in what they can do.
Then see where your interests lead you. That direction might take you to fast primes, or telephoto zooms, or an FF body, or maybe something different. Find out what you like and where your gear is limiting you. You might even change directions once or twice. You might end up with both crop and FF, because they have different capabilities.
We are just guessing based on what you are saying.
If you are still pondering your original question of FF vs crop, there are numerous web sites that do comparisons, and many threads here at POTN that talk about the advantages and disadvantages. Generally FF is best for portraits and landscapes, whereas crop has advantages for wildlife and macro photography. Pros tend to use FF (but also crop), and serious amateurs use crop (but also FF).
And don't forget, there is also micro-4/3, which is gaining ground among serious amateurs.