Just to add to the above.
Totally agree you want an approach to saving your Aperture adjustments. I initially used the functionality LR provided. It takes every Aperture adjusted file and creates a jpeg (perhaps tif as a choice, forget) and dumps them all into one folder. Leaving you with countless images you don't care about and all of them separate from the "project" folder. I trashed that catalog. I them went through every project in Aperture, filtered for 4 and 5 stars and exported those as tif's back to the same project folder. For the import to LR, I turned off its functionality.
LR's library import routine did a stellar job. Can't say the same for C1 where I was initially going.
LR did "find" over 1,000 (out of 33,000) images Aperture should have had a preview for but did not. Nor could it as I reprocessed the entire library prior to the import into LR. As I mentioned above, stability. It was never a solid database, nor was iPhoto, perhaps Photos as well -- I don't use it. The files were there, obviously the links were in Aperture as that's what LR picked up, no previews in Aperture. Nice to have them back.
I also did a major pruning and made sure my ratings and keywords were exactly what I wanted. Better to do those in an app I was very familiar with than something new.
Learn the LR shortcuts for functions you frequently use. They make getting around it far simpler.
If DAM is important to you, LR is the king of the hill. Limited to photography, it also trounces any standalone DAM apps I looked at. If DAM is not important, you have plenty of choices. Most with better demosaicing. Some free, Darktable being excellent in my view.
I had spent about 18 months with LR due to lack of camera support but went back once support for XTrans was available. The moment Apple announced the discontinuation of Aperture I bought the current versions of LR and C1. Played with both for over a year, ran 2,000 like images through all 3. In the end my conclusions were: Aperture is dead and it's only a matter of time irrespective of how much I like it. LR is solid, I gave up some excellence on the Develop side but DAM was superb and it just worked. C1 (v7 & 8) Develop side is superb other than the initial renders of color hue. At infrequent times almost comical with what it initially renders for color. Though not the simplest to get my hands around. The DAM side was little better than using a browser, very picky with jpegs and tifs. Sometimes it won't import them. As my better shots typically have jpeg or tif counterparts, this was a hassle. LR was the easy pick. No regrets.
