"Sonar X3 Studio" vs "Sonar Professional"

I think nothing really, it just comes with less additional features. The core program is still the same. You would need to consider what is really worth losing in place of newer features. 

interpolated
I think nothing really, it just comes with less additional features. The core program is still the same. You would need to consider what is really worth losing in place of newer features. 

Incorrect.
 
He does not have Re-Matrix, Style Dials, Bark of the Dog Pro Channel, LP EQ, LP Multiband Compression, Adaptive Limiter, Rapture Session, Ripple Editing Mix Recall, Virtual Controler the ability to use Melodye to Create a Tempo map as a drag and drop into the time line (I think you can do this is Professional, I know you can in Platinum - need to check on that)
 
OP, look down this list and anywhere you see "Professional" then this is something you don't have as an X3 owner:
http://www.cakewalk.com/Products/SONAR/Whats-New#2017.06
 
 With the 50% off promo going on (and presumably your last chance to make the upgrade to without paying full price), you might really consider looking at the Platinum product.  

In hindsight I was comparing platinum to the professional version of the current software. Yes it's true that you get more features in platinum however the core program has most of the same stuff. I confess that i just went for the highest possible version of Sonar whenever I could. Same with all daw really.

Thank you all for your replies.
 
Judging from my profile picture a person might deduce that I'm a musician. Well, I'm not. I just like "funnin' around." To be honest, many of the features I have now I never use. 
 
I wouldn't want to lose any instruments. I have a TTS-1 patch that I like a lot. I also have Rapture Pro.
 
But they say if it ain't broke, don't fix it. But at 50% off for Professional, I dunno. :-/
 
John

If you like Sonar period it should be a "no brainer", especially with the discount you would get!
I have early Sonar Professional 2016 up from X2 and X3 and I can't wait to get the current version just on the fact that it generates mp3 files!

I would say the upgrade pricing is a good deal.  Plus that gets you onto a supported version of Sonar.  That could come in handy if you want to use the latest Windows, and Microsoft changes some code that breaks something in older application software.  At the moment X1-X3 still works, but no more patches or updates for the Sonar X series!
 
I have several other software packages that used to work fine with Win XP, but are completely useless to me now on Windows 10.  It was stuff that I only used on occasion, so couldn't see paying for upgrades.  Maybe should have upgraded some while I was still eligible.  Something to consider ...