As a former 414 owner who has played several 814s, I will say that 814 Rosewood will have a more focused bass, slightly richer sounding than the 414. But unless you have an 814 playing next to a 414, you probably would not notice that much of a difference. Both will have the same sitka top, so the back and sides will only color the tone a bit, IMO. With the price difference, a 414 would give you a great Taylor, plus lots of strings, a strap, a capo, a tuner -- all that other necessary stuff!
The only reason I might recommend the 814 over the 414 is if you were doing serious recording, and you specifically want the classic Rosewood tone. But the 414 will record fine as well.