Benefits/disadvantages of pure L3 links between switches vs /30 VLANs

Hi all,

I have discovered that my predecessor used sometimes option 1 (subject) and sometimes option 2 to establish links between switches, example below:

switchport access vlan 333

switchport trunk encapsulation dot1q

switchport trunk native vlan 333

switchport trunk allowed vlan 1,2,3,4

switchport mode trunk

Can anyone summarize REAL benefits or disadvantages of using one or another ?

Obviously the fact that using /30 subnet for the dedicated "link" vlan (333 ^^^) wastes one of those 4096 available, but apart from that, from performance or any other perspective ?

Maybe the possibility of easily adding more VLANs to the "VLAN-ed link" in the future ?

Thanks