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I am torn between a new full frame A7ii or a Canon T7i. I currently shoot on a canon digital rebel and have some kit glass i can use if I buy the T7i. I shoot many landscapes, wildlife, scenic pics. I heard the full frame is better for shooting the milky way which I would like to try.
I can get a sony A7ii for $935 with the kit 28-70mm lens I can get the T7i with no lens for $550
Which would you buy
You don't buy a camera, you buy a system
In principle, you could adapt the EF lenses to the Sony camera, but in practice, you can't, because autofocus will be less than ideal with adapted lenses. The only cameras that can use adapted EF lenses and have as good as native autofocus are Canon RF cameras. If shooting wildlife, autofocus performance is the most important characteristic of a lens along with sharpness.
Decide what you want to shoot, and look at what kinds of lenses are available for those systems and what they cost. For example, I have found the Canon 400L/5.6 lens ideal for bird photography when used with a crop sensor camera.
You won't be shooting landscapes and milky way with the same lens so that's at least two lenses you need right there. Perhaps even three, as a fast wide prime for milky way shots might not be ideal for general purpose use.
If you only have kit glass for one system already, don't use that as a criterion; kit glass is cheap.
Next, after selecting the lenses, select camera body / bodies with good enough performance
For example, for shooting quickly moving wildlife, the Sony A7II only has 5fps burst rate and the T7i has slightly better at 6fps. Neither is the best possible available for those systems, but could do in a pinch.
If shooting wildlife with the Canon system, I think 90D is about optimal nowadays. For Sony, I have no experience with those bodies but would pick something better than the A7II limited to only 5fps.
You might need two cameras
When shooting very small wildlife such as birds, you probably want to have either (1) a camera body with huge burst rate and huge megapixel count (extremely expensive), or (2) a crop sensor camera with good pixel density. The latter is cheaper. In fact, it might be cheaper to purchase a general purpose + astrophotography camera and a wildlife camera than a camera optimized for both at the same time.
My current setup is EOS RP (full frame) + EOS 90D (crop) but I don't claim this setup is ideal for everyone. For example, if shooting indoor sports, neither camera is ideal. If shooting indoor sports, the full frame camera should have a better fps burst rate. But I don't shoot indoor sports.
In my experience, DSLR canon is more water-resistant than Sony mirrorless. When my friend and I doing a prewedding photoshoot, unfortunately, the weather is heavily drizzling. My friend who uses Sony alpha a7ii, the camera suddenly dies because the top of the camera (for flash) is spotted in the rain. But mine (Canon 5D mark ii) is fine. Also my friend who use Nikon and spotted on sea water.
It all depends on how your budget-wise and how your travel style. IMHO, if you ok with a heavy/big camera, for durability it is better with Canon or Nikon. If you prefer a light camera, maybe Sony is a good option.
