I am leaning towards the bench scope as it does seem to be a better spec option but I'm really tempted to create my own 10" scope with the VDS1022 attached to the back of a now un-used windows10 tablet and if the VDS1022 does most of the heavy lifting in hardware then it should work OK and I can even plug it into my desktop PC when a bigger screen is required and now you say there is Android SW as well ..... it must be Christmas!!
I just installed and tested the VDS1022I on a 10" Windows8 tablet. It worked surprisingly well, easier to manipulate with just the touch screen than I thought it would be.
Really, the only issue is certain UI elements are smallish, not too hard to manipulate with the mouse, but a bit trickier with just touch.
Most if not all of these are also available through the menu, which is quite easy to operate touch - I'm talking about the on-screen shortcuts, for example, you can "click" the vertical voltage/div display to directly bring up the adjustment menu.
Probably the only ones that might "annoy" you is adjusting vertical position, triggering and horizontal position by dragging little "triangle" markers at the edge of the grid display. Since my finger is bigger than the markers, it's hard to see when I am on it - but I'm sure you would get used to it with a bit of practice ... as noted above, I found it easier than I thought it would be.
BUT!!! - still nowhere near as nice to operate as a bench scope!
You can get a feel for it before you buy the scope if you like, because the OWON software can be downloaded from their site, and will install and run without the scope. You obviously can't capture any waveforms, but you can move the above mentioned points and access the menus, on-screen shortcuts and other settings, which might be a worthwhile exercise.
Note that I had issues with the scope disconnecting after installing the latest (1.0.30) software from OWONs site, but no problems after clearing out and installing 1.0.29 which came with the scope. You can see my adventure towards the end of the "OWON VDS1022I Quick Teardown" thread here in this forum. I suspect it was related to using the "new" driver posted separately on OWONs site, the working install just used the driver which gets installed with the software (you still have to manually "update driver" to install it since the auto-install option via the software doesn't work).
A couple other considerations using a tablet.
The scope is powered via USB and is supplied with a "dual head" cable able to suck power from two USB ports. I measure between 350ma and 450ma of current draw, depending on what it is doing which is just within the 500ma spec for a single port. I tested it and it works fine with a standard single-head cable (That's what I used with my tablet as it does not have two USBs close enough together), but some tablet & laptop ports are not up to the full 500ma and you may need the special cable.
Processor wise it doesn't need much - my tablet is an AMD C-50 CPU (fairly low performance dual-core), and last night I tested it on an single-core Intel Atom (N270) netbook and it also ran fine.
Regards,
Dave