Surface. Yep, Microsoft's Surface, particularly the new Pro 3 running OneNote allows real time note taking with a very good quality stylus, instant on (click the pen and a new page opens ready to work, even if you're tablet is locked - a stroke of genius), you can pull in and cross reference Word docs, PPTs, web pages, etc. and the whole is synced real time back end to other devices. Need to take a photo of notes on a whiteboard, use the OfficeLens app on your phone and it gets sent to OneNote, optimized (reflections, stuff of the board, etc. eliminated) and does an OCR of what's there if the handwriting is half decent.
I use this every day - I manage or participate in half a dozen different types of meetings every day. Fan boy? Of this product, yup.
OneNote on a tablet was always good but MSFT treated it like a poor cousin - they finally understand the potential and have provided a kick ass product for EXACTLY this niche. There is no other product close to Surface for responding to this kind of usage scenario. And if just f^&*ing works. Really.