I have used some clones.
They're all not bad. except for some(most) of them you have to put some protections.
Such as Reverse polarity protection, Overvoltage protection, etc.
In terms of the functionality. They were mostly the same, except for the memory size.
But the memory for rp2 boards are already pretty big (>2M)
If you want to use many of them, I recommend you to get the most accecible one from where you are.
so the biggiest considreation could be the SIZE.