I used to use an iPad Pro 12.9 until it got too much into the way, but if you want something portable then I'd recommend a iPad 10.9 since I believe they're only 300 or an iPad air. They're smaller and faster. Unfortunately, the apple pencils can be expensive. For the iPad 10.9 or any other later model you'd need a Apple Pencil First Gen which can coat up to $99 USD, for an iPad Air or Pro you'd need the Second Generation which costs up to $125 I believe. You can get knock offs from Amazon, but I don't know how well they work.
I tried the Samsung 7? With the S Pen, but it was too slow and clunky for my tastes. :]