Assigning ports to Vlan

Hi every one.

Let say we have following requirements;

Case:A

Define vlan v20, assign port ge-0/0/1 as access port

1) Option:

set vlans v20 interface ge-0/0/1 vlan-id 20

2) Option:

Set vlans v20 vlan-id 20

set interface ge-0/0/1 unito family ethernet switching vlan member v20

Is there any benefit using option 2 over option 1?

Case B:

Define vlan v20, assign port ge-0/0/1 as trunk port.

 Is it possible to do that using only vlans heirachy ?

Thanks and have a good day!!