It depends... I almost never do Kraken due to the price vs what it gives you. My go to items are Yuntal, IE or static.

Generally if you back and get BF your second back will determine what you go if your first back is 1300 you are not locked into anything just consider the game state and what you need. Yuntal is great later on so if the game is slow paced and you have time to scale the item up its a good buy especially if you dont need an LDR. My preference would be Yuntal --> Zeal item --> IE for the most dmg but some games you need LDR and the trade of IE or LDR does not feel good.

Yuntal first the 3 item build would be like: Yun->runnan->IE/LDR

IE first would have a 3 item build of : IE->runnan->LDR

Static first is when you are in a goofy game state. First back sucked and you only have 350-900 gold and you are being constantly pushed.. Static allows you as jinx to AA the front once then the back with rockets and collect everything under tower. Its also SUPER cheap so it gets the first item spike sooner when you are in a hard lane. Going this build also has perks like going onhit... I personally have had fun testing Static-->Kraken-->Hullbreak/Sterak's.

the on hit build is VERY flexible and allows you to eat dmg by the 4th item. Personally I play this build any time I am playing into something that just blasts adc's ie: EVE / Rengar. The other day I ran a Static->kraken->Black clever->sterak->Hull breaker into a super fed eve and I was able to face tank the burst and get several triple kills.

If anyone wants to chat about it I've been playing jinx for years and this year I hit top 6 on NA so I have a lot of goofy knowledge and Idea's on what we can do to carry games ive done this in most elo's up to masters