If you were a WW fighter, what would you consider...

[KING MEAT]

... the greatest achievement of your boxing career be?

fighting Floyd Mayweather?
or Fighting Manny Pacquiao?

and why?

[SeekDaGreat]

Fighting Floyd, the "0", the challenge of cracking the shield, etc.

Fighting Manny would be a great accomplishment as well but let's be honest he has 5 losses, he's been outboxed, he's been knocked out, knocked down, etc. nothing we haven't seen with Manny so it loses a bit of it's edge, imo.

[J The UnBiased]

Beating Floyd. Manny has tasted defeat many times by several different opponents. Beating Floyd is by far the greatest accomplishment in boxing right now and it's not even close.

[BUNGALOWS]

To answer your question. Either guy.

As for beating. Obviously Floyd.

[Mr.Fantastic]

Fighting the greater guy which is Pacquiao.

[way2strong]

Do I want a good sized paycheck getting my orbital bone/nose/jaw(pre-cracked) broken or do I want a good sized paycheck getting tapped and ran away from 12 long exhausting rounds... I rather accept the workout challenge and eat good the next day without using a straw

[JmH Reborn]

I'd rather be in the ring with the greater all-around fighter who'll be historically be looked at more favorable - Pacman

[Grimgash]

Mayweather. Itll be huge if hes ever beaten. Beating Manny at this point is great but not on that level.