Higher VG will likely gunk up coils a bit faster than higher PG juices. VG is a bit sweeter than PG and it's the sugars that gunk coils the most. However, VG by itself doesn't really gunk a lot...just a little bit more than PG. Certainly, sweeter juices will gunk the most.
VG produces more vapor and is better for sub-ohm devices in use today. Personally, as an old smoker, I can't handle too much VG because it causes me to have more phlegm, so I keep mine at 20-30% VG. To each his own.