only white! acv would make a nasty sticky mess, and balsamic is way too expensive, lol. i always add eo's to my vinegar, but it takes more than a few drops. i guess the more water, the less eo you need to mask the wv smell, though.
In Clean House, Clean Planet, the author talks about how she only buys Heinz's White Vinegar, as the smell isn't as strong as other brands.
MY favorite eo's for vinegar are equal peppermint and rosemary
I spike the whole gallon w about 12-15 drops each and then pour it into smaller bottles for under the kitchen and bathroom sinks and put the large bottle in the laundry room.