I want to get the large bottle but I am confused as to which to get. Should I just get both styles (I will probably end up with both since I am grossly afflicted with compulsion) and are they interchangable? Subtle differences or dramatically different? Is there a good source for both styles so I could/can get from one vendor? TIA. I figure if i don't like them I can PIF or use it to kill fire ants and weeds.