I use tabs for utility PCBs, and it works well. Haven’t used v-cuts, but mostly because they’re not very precise (you need to leave more space around the board) and I don’t really like the look of them 
. With routing, most of the outline looks nice, and a tiny bit of filing/sanding makes the rest less visible.
Make sure you check the PCB fab’s panelization guidelines before ordering (e.g. your tabs are probably too small for JLCPCB).
Also, only one diode?