AirDrop now actually works pretty consistently between my devices but it took some playing around to figure out how. WiFi and Bluetooth both need to be enabled even if you are not connected to a WiFi network. If you do that, then the devices find the each other and you can transfer files though I've only used it for photos. I had ordered the camera connection kit which allows you to plug in an SD card using a USB adaptor. This should allow me to use photos from the DSLR if desired and possibly GoPro video. The USB port on the camera connection kit will also support the Ethernet adaptor as well as a number of other USB peripherals. (Or so I hear)
The Apple Pencil is another accessory that only works with the iPad Pro models but the number of applications that support it are few. The digitizer has very high resolution and very fine, detailed drawings and lettering can now be made. Unfortunately, there isn't an easy way to carry around the overpriced stylus.
The 9.7" iPad Pro with the "Smart Keyboard Cover" weighs in at 1.5 lbs. Pretty light. But, my newish MacBook weighs just a shade over 2 lbs. Not a whole lot of difference. The iPad isn't tied to Wi-Fi as it has a Verizon SIM installed. Both devices have all day battery life and very nice high resolution displays. Would I recommend the 9.7" iPad Pro? Absolutely but it isn't a replacement for the laptop but it may be all I bring on short trips when I need to travel light. For longer trips, I occasionally need the additional flexibility provided by a laptop,