My thought's on Bloodthristier Vrs Hydra
Lately I've seen alot of people taking
over 
Why? let's compare
Stats
+80 Ad
+20% life steal
+Overheal shield max 350
Cost = 3500
+75 AD
+12% Life Steal
- Aoe - 20-60% ad damage to near by enemies
- Active - deals 60%-100% ad damage to near by enemies resets attack animation Cost = 3300
Pro's and Cons
Pro's
Nice Ad
Great Life steal
Nice shield for early/mid game
Con's
Single target use
Cost 200 more gold
Shield becomes less effective late game
Costly Build path aka : 
Pro's
Nice AD
Deal's Aoe damage
Has active that resets attack
Has Life steal
Great wave clear
200 cheaper
Easy build path.
Con's
5 less AD
No hp shield
In Game Usefulness
The only two things I can say this thing has over hydra is its exstra 5 AD and the shield so lets look at what those have to offer
5 AD with tri force and 100% crit from
at 250% damage
5*2(for the proc of
) = 10 AD
10AD crits at 250%(
) = 25 exstra AD
Shield meh, 350 hp boost that isnt always there, good for aborbing some damage but late game with people hitting for 1500 to 2000 not really that great.

Allows you to get CS like crazy allowing you to get full build 15mins earlyer than you would with Blood.
Its Active is a beast just look at what happens for example I'll use Ashe
with 100% crit and tri force above
Ashe uses W or E to proc Tri force 75+75AD = 150 ad next attack hits enemy basic attack 150AD crits (1502.5) = 375 then activate hydra which resets attack animation hits for 75 ad that crits again bc of the 100% crit chance we are using 752.5= 187 Ashe hits her W which procs Tri force again 375 damage again
just basic attacks just dealt : 375+187+375 =937 damage in under 2 seconds, she would still have her ult and that shield of Blood's is gone. This damage doesn't even count the damage she has dealt with her W.
and fyi she just healed for 122 hp.
In conclusion
I would just like to say for the sake of your team, Never ever pick Blood over Hydra the 5Ad and shield will never equal Hydra's passive strength I honestly can not think of even 1 reason why to take it over hydra. If the enemy team's focusing on you, don't be the one to engage the fight let your tanks do that, after all its their job to start the fight, It's your job to finish it.
Ps: Yes this goes for you Ranged champions too.... Bc guess what? you don't get the wave clear but you still can use the active. Would you rather have a shield or 2 basic attacks Mr adc?