Best Battery Charger for Multiple Packs Before Flying?

I have a whoopstor for my whoops and a B6neo+ in my bag for 4s, and I have a imars d300 for my cars that stays at home. I have been using that d300 to charge 2 at a time. I can only charge 3 batteries total at a time currently. Should I just get one of those Hota F6 or F6+ or Pro? Should I just buy another rock solid d300? What are you all rocking to charge lots of batteries before fun time?