Please recommend a distro for a Lenovo ThinkPad tablet PC - touchscreen a must

I am not a total newbie, but it's been years since I've used Linux, so I will need some hand-holding and appreciate this forum. I am becoming increasingly frustrated with my Lenovo ThinkPad tablet PC running Windows 10. I re-installed Windows and it has been quirky ever since. Here's what's under the hood:

Intel Atom CPU Z2760 running at 1.8 Ghz
2 GB RAM
32 bit processor

I've used Puppy in the past and somewhat familiar with both Ubuntu and Mint. I really have no preference but it must be easy to learn and allow me to use the touchscreen. There is only one USB port but I plug in a hub which allows me 4 peripherals. At my desk I prefer a physical keyboard and mouse although there will be times when I want to disconnect the hub and use the touchscreen and virtual keyboard. The main purpose of this tablet is to download PDF files and read them while I'm on the treadmill at the gym. So I don't need a lot of fancy features or video/audio playback capability. The one thing I would like to do is turn it to use either in portrait or landscape mode.

Any suggestions will be greatly appreciated.