Best Version to be use in Mikrotik Products

RouterOS Wireless Networking
1

Hello Mikrotik Support & All other Seniors,

I need your advise what is the best O/S operating version to use in following devices, up to date.

1- CCR1036-12G-4S-EM
2- RB911G-5HPnD-QRT
3- RBSXT-5HPnD
4- RBMetal5SHPn
5- RBSXT-5nDr2

Is the Firmware is something different to be updated ?

2

for 2,3,5 routeros v6.19 and wireless-fp enabled and newest bootloader