If you want better image quality, it will come down to the lens you're using when you take picture. All canon rebel lens (unless you go for the premium kit lens which I will go to that later) come with EF-S 18-55mm which for beginner is okay lens to start. For now, Canon is throwing another lens into those bundle which might be a good bundle for starter. I am not a canon guy as I use Sony equipment (too much money to waste? go to sony) but do test out some of canon equipment before mostly for what I work and have to test people camera.
I don't want to go crazy on lens review as this isn't something I do but they is someone who did a decent impression of those lens. I will post a video of the lens of the one of the link so you can have a good impression of those lens. Remember, this is someone impression so, it doesn't mean the lens suck but can do better.
Canon 75-300mm f/4-5.6 USM III lens review:
https://www.youtube.com/watch?v=QI7mZHBf5YU
Canon EF-S 55-250mm f/4-5.6 IS STM lens review
https://www.youtube.com/watch?v=N5wZAvUmPUA
Canon 18-55mm f/3.5-5.6 IS STM lens review
https://www.youtube.com/watch?v=waBjGxsGSg8
Something to look into, if your budget is a bit higher and don't want to have two lens and want to stick with only one lens period, you might want to look below.
http://www.bhphotovideo.com/c/product/1116102-REG/canon_0591c005_eos_rebel_t6i_dslr.html
I actually own the same lens and using it on my sony with an adapter. It's actually a very good lens for photo and video. This is the same lens from the 70D and for video I take, it look nice. An impression video below.
Canon EF-S 18-135mm f/3.5-5.6 IS STM lens review
https://www.youtube.com/watch?v=_j7hQ17G_uk