Please elaborate "tends to choke"?
I think in 3.16.x or 3.17.x was where Kobo added "sickel", a process that reboots the Kobo when things appear to be hanging, and it was sometimes too aggressive (rebooted the device even when there was no real need to) so it was disabled later on...
So if your problem is unwanted reboots, both older and newer firmwares might help you.
I'd always try with latest firmware first and only downgrade if you have a specific issue with it you hope to solve...
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