ooh, this is a tough one. you've chosen wisely, narrowing down to twine or japanese masking tape. i love both and use them ALL of the time. they are great additional resources to any craft supply kit. my answer would have to be based on what you want to use them for.

if you're doing tons of wrapping with bags or bundling small items or tying sweet bows, go with the twine. i find hundreds of uses for it and it seems to last forever. i love dolling up a small gift with a sweet twine bow. twine is a must for the holidays.

however japanese tape finds itself into my daily routine as well. it's a fun alternative to tying gifts with ribbon, a welcome addition to every package or envelope i mail, i love sticking it on everything. you'll find lots of uses for it. i like having a few different widths and colors to play around with.

i can't choose a favorite. i love them both. best of luck. you really can't go wrong with either.