A few additional thoughts to add to Bob's:

Size
It depends on which instrument you play and where you like to have your music stand. We have Tuba, French horn, Double bass, violin players where typically their music stand is further away from where they sit or stand (compared to other instruments) because of the position/size of their instrument, so need a larger tablet size to see from that distance.
In contrast a keyboard player, guitarist, flute (etc.) position it closer so a smaller tablet or phone is all that is required.

If you are at jam sessions and others will be viewing your tablet, then larger would be better so you can all stand back but still view it.

Or if you move about on the stage (e.g. vocalist, guitarist, sax), a larger tablet might probably be better, as you can still see the chart as you move.

OS
Check our specifications here:
https://technimo.helpshift.com/hc/en...all-ireal-pro/
We update iReal Pro several times a year (free updates) and sometimes the minimum OS it will now function in is a later OS version. The Play Store should automatically install the latest version of iReal Pro for the OS version it detects on your tablet.

E-Ink
There are a few e-ink tablets available with the Android OS, which allow viewing in full sun, glare or other highly lit environments. There are different sizes.
https://www.irealb.com/forums/showth...-e-ink-tablets
Some have front lights for dark environments, others do not (you need ambient light or bring your own).

We have various musicians using larger tablets, the larger iPad sizes. It may also depend on what else (what other apps) you might use (sketching, drawing, DAW etc.)
As the tablet size goes up, it would be heavier and less portable, although compared to taking a bunch of printed Fake books...