Moving VMs From One Hyper-v 2012 R2 to Another Hyper-v 2012 R2

Hi everyone, was hoping for some help in something I am confused about

Currently I have SERVER1 running hyper-v 2012 R2

I want to move all my VMs (around 20)  to SERVER2 also running Hyper-v 2012 R2

But I am confused on the best way to do this

1) should I just click on "MOVE" on SERVER1 to move to SERVER2?

2) Should I do an export and then import

3) should I setup replication from Server1 to Server2 and then do a failover?

4) or should I shut the VM down, copy the VHDX file and then create a new VM and use that VHDX

I just want to be cautious and use the best method to ensure it goes smooth and not worry about any corruption. Can anyone offer some advice?

thanks