Oxalic dribble or a vaporiser for four hives in Kent — which would you buy, and what safety kit do I actually need?

Kent, third year, five colonies after the unite. My winter treatment has always been a dribble because that's what my mentor lent me, and a few people at the association are telling me I should buy a vaporiser instead. What I think I know. A dribble is a solution trickled between the frames while the colony is broodless; the kit is a syringe and a container, it's cheap, and I can do five hives in ten minutes without a battery. Vaporising drives the acid through the hive as a vapour; it needs a device, power, and the hive sealed for a few minutes, so it's slower per hive but reportedly kinder to the bees. My actual questions. For a hobbyist with five hives, is there any real benefit to the vaporiser, or is that a commercial tool I'd be buying for the fun of owning it? What safety equipment is genuinely necessary for each — I've got goggles and nitrile gloves and I assume vapour needs proper respiratory protection? Whichever it is, I'll be using a licensed product and following its label, so I'm asking about method and equipment rather than amounts.