Void if pro scene.

If he catches Sniper in Cronosphere that's right.

I have already said it depends on who is more aware, has sharper reflections and better ward*****es in team. Excluding stupid overfarm scenarios when Void has BKB+MoM before Sniper gets Blink, or when Sniper pwns Void after Chrono ends.

I personally don't find Void to be that strong of a carry. He is kited very easily and suffers from the same problems as lifestealer. He has a hard time dealing REAL DPS in a fight without chrono. Compare 5 seconds of Void right click with his ult, to 5 seconds of Medusa right click with her ult or 5 seconds of Specters right click with her ult (Especially if she has radiance). Speaking of a weakness without chrono, that's another problem with Void... He has no buyback potential. A specter without ult can still burn with radi. A Medusa still has huge DPS and tank. A Void without ult is like a TB that used meta and died immediately. No BB potential.

Void is like troll but with more utility and more aggressive early game. He has an evasion compared to troll blind, he has a bash. But where troll excels in man fight, and a better laning phase due to range, Void has guaranteed lock down and an equally reliable slow but with higher DPS since it also positions him better than anything troll has before blink.

I think Sniper beats Void because the only way to kill a good sniper is a position independent spell like haunt, thunder gods wrath, storm zip, etc. Any decent player can blink out of a leap/chrono. Sniper will also ALWAYS be much more farmed than void because his laning is completely insane and Voids is rubbish.

And if you go blink/Shadowblade on Void just to lane chrono, there are SO many counters to chronosphere that it's almost not viable. Defensive spells that work regardless of Void BKBing or not like SD's eat, ES wall, Venge swap, Guardian angel, etc can be drafted against Void. Let's even say you last pick Void and they didn't draft any of those heroes... If the void starts to build a shadow blade or gets a blink... First of all he will have no damage. Second of all, you're just going to get split pushed and they're going to trade towers and map control for heroes.

If you draft void and keep getting picks with guaranteed chronos, while opponents farm other lanes (And Void will need back up if he goes blink, because he won't even kill supports with that item build) the opponents are going to keep farming your jungle and other lanes. By the time you are attempting to break base and your Void has some REAL carry items, they should have an E-blade. I just saw a great game yesterday where troll would just beat on a tower and when Void chrono him, Ember would E-blade.

I don't think Void can carry by himself, but I think he has some of the largest wombo combo potential of any carry. I still remember PR vs NIP when chshrct landed a 4 man chrono after they just lost 2 rax. They won immediately after, even though his score on Void was 3-11 his ult won the fight. However in pro games these ults are rare. For every one HUGE 4 man chrono, there are 20 "meh" ones, and one complete fail.

Cliffs:
-FV isn't the hardest carry because his BB sucks, and his total DPS in a teamfight is lacking
-Chrono is countered easily if you catch 1 big target, or sometimes several with spells like GA
-Most carries now have mobility or are very tanky. When I say "mobility" I mean slark/Ember... Not a 13s CD leap.
-FV has the highest combo potential of any carry. When spells are centered around Chronosphere, I think the team fight that Void brings outclasses any amount of farm other carries have (For the most part). But it's risky and unreliable to draft around that.
-Sniper > Void because by the time Void has one item, Sniper has 2. If you draft sniper, you are going to draft defensive supports. No good player is going to yell on skype "WAIT WHAT? THEY DRAFTED SOME SORT OF GAP CLOSER AGAINST OUR SNIPER?! HOLY COW I NEVER EVEN THOUGHT OF THAT! JUST CALL GG!"