Need help for NAS best choice !

[Enquiries]

Hello ! I'm looking to change my DS224+ for a 4 Bay, i only use my NAS for Plex (Friends & Family).

I hesitate between this 3 :

DS423+
QNAP TS-464
Asustor Lockerstor 4 Gen 2

Wich one would be better? Do i neet raid or RAID0 or jbod is correct for Plex use ? (I don't need backups)

And why the 918+ of Syno is so high in the review without transcoding ?

Thanks for your help.

Best regards,
Maxime.