So...I'm a die-hard VMware lover since being an alpha Workstation user in the late 90s for running Linux on Windows then vice versa, managed thousands of VMs with ESX, vSphere, ... and jumped when Fusion came out. I've build VMs on Fusion for production and R&D ESX deployment, as well as others for team/developer deployments. In short, I always trusted VMWare. I tries Fusion once early on, mainly as it was nearly free, as both VMWare and Parallels were getting into the obnoxious 'forced upgrade' pattern and my Fusion needed to be upgraded. I saw nothing compelling about Parallels at the time.
Having said that...I needed to spin up some VMs again for work, this time via P2V (Physical to Virtual converter) as I was imaging my (Windows) work laptop to my MBP..and it had a lot of software pre-installed, so couldn't easily build from scratch. I was surprised to see the number of issues I ran into with their latest P2V - failing missing openssl bits, needing to kill off 'extra' installer processes on the Windows side (the initial cloned ailed so had to use agent and do via direct connected network instead, effectively running a client on the Windows system and cloning over the network to my MBP..).
Finally got it working, but it was NOT a great experience.
I'd dig around and compare virtual/shared filesystem performance - I also run VS and SQL Server tools in my VM, but rarely as I'm no longer a day to day dev, but I did see some griping about Fusion's shared filesystem performance, and another thread where a
Fusion developer basically admitted Fusion doesn't get many resources, and their shared filesystem is in serious need of upgrade. The thread in question is also specifically discussing VS checkout/build/compile performance via a shared filesystem, which may be relevant to you.
https://communities.vmware.com/thread/520731
I hate to say it, as I
really dislike the 'yearly forced upgrade' model
both Parallels and Fusion have turned into, and I have former peers and co-workers that have worked at VMWare plus a professional history with them, but - YMMV.