Hi Sharona,
I'll start by saying I think I'm probably a little biased as I'm a big fan of Fujifilm cameras. I originally owned the Canon 5D Mark iii and loved it, but was somewhat drawn to the more tactile appearance of the Fujifilm X-T1 with the manual dials so ended up buying one to shoot alongside the 5D. It was a great shooting experience but lacked autofocus speed, dual card slots and a host of other features. I wouldn't have had it as my sole camera. About 6 months afterwards though, the X-Pro 2 came along - this upgraded the sensor, processor, added dual card slots, and loads more. About 2 months after getting it I sold my Canon gear - I think it's
that good. I now also own the new X100F, so I'm totally mirrorless. I photograph weddings professionally using this gear and think it's great (although there will always be some people with differing opinions).
While I don't have experience with the X-T2 or X-T20, I do have experience with the X-T1 and X-Pro 2. If you're not interested in the rangefinder form factor or hybrid viewfinder (the X-Pro 2 has both an electronic viewfinder and optical) then you're right to think about the 'T' line as opposed to the 'Pro' line. The X-T2 and X-Pro 2 are almost the same cameras in terms of spec, but I'd argue the X-Pro 2 is more of a niche. If you hadn't yet considered the rangefinder styled X-Pro 2, or for that matter the X100 series cameras then I'd encourage you to - the X100 cameras are very small, light and the X100F has the same sensor / image quality as the Pro2 and T2.
This is all somewhat waffling around your question though (I love the opportunity to talk about these cameras anytime I can!! I think they're pretty underappreciated). In terms of comparing the X-T20 and X-T2 in terms of how well they would do the artsy / macro stuff, they'll both perform equally as well from my understanding. They both have the same sensor (24mp), the same processor, the same ISO capabilities etc. Where they differ is in the video and weather resistance (as you've pointed out), and also in the fact that the X-T20 has a touch screen where the X-T2. The X-T2 has a faster mechanical shutter (but both have an electronic shutter if needed) and the X-T2 does 14fps to the X-T20's 8fps. To me, none of this would particularly matter. The big one for me would be the extra card slot in the X-T2 as you can back-up on the fly. Having said that, it wouldn't be a deal breaker for me. For a more detailed comparison you could check out
http://cameradecision.com/compare/Fujifilm-X-T20-vs-Fujifilm-X-T2
The Fujifilm cameras all use electronic viewfinders which can take some getting used to after coming from a DSLR. It's incredibly helpful to me to be able to see the exact picture you're going to get before you press the shutter down, but it can be strange at first. I would strongly encourage you to try before you buy on any Fujifilm cameras if you're coming from a DSLR - I found that they felt completely alien after shooting with a Canon for years, particularly with the physical dials (the lenses, for example, also have a manual aperture ring).
There's some good glass out there for these cameras too, especially if you like prime lenses (again, I actually shot with zooms before I switched to Fujifilm) - I currently own the 16mm f/1.4, 23mm f/1.4 and 56mm f/1.2. For such fast lenses they're comparatively affordable which means you can get a load of light in the darkest situations.
The out of camera JPEGs are great and there are some good film simulations that are unique to Fujifilm - I like to shoot RAW + JPEG and 50% of the time I'll use the JPEGs as they come out of the camera...less time at a computer has to be a good thing!
If I had any negatives, it would be that sharpening Fujifilm files in post can be a bit tricky - they can present artefacts quite easily. Also, if you're pixel peeping they're never going to stand up to full frame cameras ... (but I probably wouldn't expect them too anyway).
Hopefully this helps, but I'd love to answer any more questions you might have. While you wont get a sense for image quality so much, here are a couple of casual family candids and general shots I took on our recent trip to
Disneyland. These were all shot with the X100F (so same sensor as X-T2 / X-T20) - they won't win any awards but they're real world examples.
(I've tried to include a bit of a mix of stuff here, unfortunately no macro, and as you can see I do like a black and white. I've shown some of these in various other threads too, so apologies if anyone's stumbling across this and has already seen them.)