From what I have seen so far, this is like asking "What is better, PS4 or Xbox One?"This kind of question can trigger a holy war.
Hahaha, exactly.
If I recall, at the time I made my initial purchase, Parallels had _just_ taken the lead feature-wise, I did a trial install, it worked perfectly, the price was the same (both had some kind of special offer). That was it, I was committed to Parallels. That being said, I do occasionally review the features, performance, pricing, etc., between the two, and I just haven't seen a reason to switch since Parallels continues to run extremely well for me.
In terms of ongoing cost, I recently wrote this in another thread:
I skip every other version of PD (went from PD8 to PD10) as the version released for the current OSX works for the next major release. When I do update, I usually score a discounted version for $39 (there's about an offer a week), or an upgrade/full in a bundle that effectively costs $30-35.
So at least for me, for the last few years, I've spent about $40/2-years on PD after my initial purchase (which itself was discounted).
Side note: We find the Wii-U is the most fun
At one point there was a documented cap, but it seems like a bit of a crap shoot whether or not it got enforced (and it seemed to vary based on location). It seems like I recall them loosening up the consumer service limits[?]
We're on Biz Class so no cap (specifically documented as part of the Biz Services agreement).
