Thanks everyone! A few things to clarify:
1) Sorry for my type-o in my question! The second part of it should read "I want to know every little difference between the two offerings".
2) In seems that the online version DOES do schedule C this year - which is why I'm so intrigued. Sorry Opus 17, but I believe your answer is out of date.
3) For other looking into the same type of situation as me – services like Betterment definitely do 1000+ transactions – especially with automatic tax harvesting involved - so the summary options as mentioned in the support article seems to be the way to go – but I wonder if you can 'attach' the list of transactions – I think in the past I had to mail that supplement in.
Thanks for answering so far!
