It all depends on what you are looking for, and how much you are willing to pay.
Here are a few top contenders:
UltraTax: Generally considered better software, but definitely higher priced and is worksheet-based, so there will be a steep learning curve. Made by a company focusing on tax preparers, rather than consumer do-it-yourself software.
Drake: Superior customer support, lower cost and many people think it is the best thing ever. However, it is less automated and definitely more 'clunky'. It is mostly worksheet based (which means a steep learning curve). Made by a company focusing on tax preparers, rather than consumer do-it-yourself software.
ATX: Lower cost and similar entry as ProSeries. Less automated and a bit more time consuming to enter data. Made by a company focusing on tax preparers, rather than consumer do-it-yourself software.
TaxAct Professional: Lower cost and VERY similar entry to ProSeries, so the learning curve will be fairly small. However, less automated and made by a company focusing on do-it-yourself software.
There are others brands of software, but these are the one that most people consider.
Once you figure out which one(s) you may be interested in, download a free demo, and give it a GOOD chance while testing out the demo. Try entering a variety of your current clients into the demo software to see how that software works. Again, there will be a learning curve with any change of software, so give a good lengthy test before deciding.
As the others have said, there will be problems with any software, but I do agree with you, Intuit software seems to be consistently declining in quality every year, so testing out other software is a good idea. After testing it, you may decide to change, or you may decide that ProSeries is still the best software for your situation, despite its declining quality.
Intuit T-shirts to those that stick around for 2019 taxes! 
:joy:
Intuit does seem to be leaning more and more towards consumers these past two years.
