I am finding a Machete + Flask start with 21+ in utility to be very helpful in new the new jungle. The sustain from the utility tree is excellent, and after the first clear, Crystalline Flask keeps you at max hp pretty much on all future clears, with no additional gold cost. You can also pop it at the start of a fight like you would a health pot. The mana sustain is also useful.
Its basically like a gp10 item that spends the money it makes on potions, two health and one mana per back. For the first clear, its like 2 pots, and with a "leash" (team dmg on wolf/blue), I am making it through first clear just fine, though without enough hp to gank afterward.
Compared to starting Machete + Pots, you have a bit less sustain on that first clear/no chance of gank right away, but every future clear is much stronger and leaves you at full hp to gank, and keeps your mana up. Enemy junglers generally arent ganking right away either (at least in ~1500 elo), so I'm not finding my team behind because I waited to gank until after first clear.
What are your thoughts on this?
Is utility now the jungle sustain tree, or are people better off still going 21 defense?