Regarding what you have from Evernote, most of these can be done with DTPO.
-Unlimited Sync across devices
[Certainly possible with DTPO and DTTG2 – and you get to control/choose the location/cloud system]
-Monthly Uploads of 10GB (I only use about 1~2gb)
[Since DTPO<>DTTG2 can work with Dropbox, iCloud, Box etc., this is kind of ‘built-in’]
-Access notebooks offline if I want
[Again, depending on how you ‘sync’ to your devices, this is a given. I have +/-40GBs of data on my iPad/iPhone, all accessible (downloaded) and synced from DTPO on my Macs]
-Forward emails to evernote
[This will require a little bit of a workaround. DTPO allows for rules to be set up in Mail.app, and when the criteria is met, the email is imported into DTPO. Since DTPO can also index cloud based folders, there are other options – using something like IFTTT – to get an email to where you need it. But the short of it, is that there isn’t a dedicated email address for DTPO. That said, depending on your mail-client over on iOS, you can simply ‘share’ the email to DTTG2, so that’s also an option].
-Search in docs & attachments
[This is a given – if the file is readable inside DTPO – content can be found.]
[The DTPO annotation options are OK. But, since you can open anything inside DTPO in your ‘default’ application, annotating PDF’s can be done using DTPO, PDFPen, Skim, Preview, Highlights.app, PDF Expert, Preview etc. etc. That said, I prefer using the Apple Pencil over on the iPad to annotate, and this too works very well. I had a simple workflow that worked prior to DTTG2, and with DTTG2, it’s now even easier.]
-Scan and Digitize Business Cards (one I never use)
[Again, getting stuff into DTTG2 from other apps on iOS is really simple, so this is a given, should you need it.]
-Browse history of your notes
[Not quite sure what you mean by this, but since anything inside DTPO is searchable, combined with Smart Folders, you should be covered.]
-Discover related content
[DTPO excels at this. Here and there, you will see comments about it not being effective, or not doing what was expected. The AI features are heavily dependent on how you set up your DBs, and so it might very well be that your ‘system’ is not allowing the AI to do all that it could. But there are plenty of resources available in the Forums, explaining ‘best-practices’… When set up correctly, the Auto-Classify feature, using the AI, always makes me smile!]
I take your point on the UI – I am hopeful that it will be dramatically improved with V3 – but in all honestly, given how I am now so familiar with it, I find my focus is exclusively on my files and their content, and the UI is pretty much in the background – especially in 3-Pane view (where I am 99% of the time).
That said - keep in mind that you are able to ‘personalise’ group icons and the toolbar etc., so there is an element of ‘customisability’ to having it look more like something you would prefer.