I have used Uni graphics, Solid-works, and currently using Co Create. What ever you choose, you will have to invest TIME to learn. None of the tools can be a causal use tool when trying to learn, you will become frustrated very quickly.
Uni graphics was first, many years ago, I found it to be difficult to learn as a casual user. The newer version of Uni graphics has the best attributes of both Solid-works and Co Create.
Company went to Solid works about the time I got heavy into design work (having the engineers do their own design - prior was to have dedicated designers). I found it intuitive to use (I can visualize the part before putting it on paper) and parametric modeling made sense to me. Most of the designers who switched from Uni graphics had a real hard time making the switch. Our company's integration of Solid works made it very prone to having crashes, that was a real issue.
I moved into a different role about 6 years ago, and they were using Co create and had to switch. Non parametric modeling, Had a **** of a time making the switch, but now don't want to go back. I still use Solid works a little bit. Sometimes being able to demonstrate the motion of any assembly is useful, and the mating features in Solid works is very easy to use. (Mates in Solid works have to be used correctly or it can create havoc when making changes. I have picked up designs from other people and spent way to much time fixing stuff just to make a few small changes.) I also like the FEA package in Solid works better than Co Create. That is mostly to do with the version of Co Create I am using (older). Many of the projects I work on are huge, and I have never had a problem with Co Create pulling in the entire design, Solid works had a real issue with very large assemblies. I have never had any issues with getting designs from any other source (a lot of the companies I get design file from use Solid works and other cad systems) Co create is one of the easiest CAD system I have used to integrate files from multiple CAD systems. For the work I am currently doing, it would take me roughly 2x the time for the same designs as it did with Solid works ( I actually did a test after learning Co create - and had a hard time believing it but it was true)
As always this is just my 2 cents for what it is worth. I think CAD system is almost like the question which is better John Deere or IH, a lot depends on who you are talking to.