smb vs afp on Catalina for MyBookLive

I have an old MyBookLive which I bought in 2011. It has a 800 Mhz processor and 256 MB RAM. I have been using Chronosync to backup up folders and files from by 2016 MacBook Pro with Touch Bar from days of Lion until Catalina.

I have always used afp to connect to the shares in MBL. The transfer speed has always been only 1-2 mbps even though my home wifi is supposed to be 1 Gpbs fibre. I guess it has to do with both the MBL as well as the file protocol.

I read that afp has been deprecated more than 6 years ago since Mavericks. The last release was AFP 3.4 over seven years ago, and since the introduction of Apple’s new file system APFS, it hasn’t been supported for the sharing of APFS volumes, only for the older HFS+.

We are encouraged to use smb in place of afp. I can connect to MBL using smb. The MBL shares seem to mount faster with smb than with afp. After mounting, I ran smbutil statshares -a and found out that all the shares were connecting using smb 2.002. I heard the best is smb version 3. But when I use Chronosync to run the backups, the speed was pathetic: between 11 kbps and 90 kbps!!! I read that smb 3 have far superior transfer speeds than afp.

Here's my question. Given that my MBL is old, is it advisable to stick with afp, or it doesn't matter if my MBL is old. I should find a way to run smb3 instead of smb2?