How do these options compare in privacy/security?

Mainly don’t want my ISP to see my traffic:

Free anonymous (stated) proxy on utorrent

VS

Free anonymous (stated) proxy on utorrent + free anonymous (stated) server on openvpn

Vs

NordVPN

Should the free proxy be good enough if I keep my traffic low?

A proxy won't hide your traffic from your ISP. You need a VPN for that.