First Off alittle back ground. I'm a 70 Lock and have tried both Affl and Dest multiple times on the way up and at 70. For PvP affl is hands down better than dest cant say as far as demo goes. Now that Premades are the big thing Dest crits mean little. Not to mention cast times on Dest spells blow for pvp like someone above mentioned. Everyone guns for cloth class first. Now look at how long it takes to cast your DoTs 3 are Instant cast as Affl and UA is 1.5 sec. I always start with UA then run with the other 3. By the time the other player has time to get in range of you he's got 4 dots on him. Now Consider Dest, that big SB dmg is taking you how long when the melee are riping into you. Thats right forever, you are lucky if you even get it off. You can drop all your dots on a person in pvp and drain life over and over and usually win in a 1 on 1 fight. When the shit hits the fan and everyone is bundled together DoTing everyone in sight produces lots of dmg on the group and not just a single target. If you look at Top DPS in BG's between Affl and Dest, the affl lock is going to win and not by alittle but by alot.
For end game 5 man instances you probably wont be the top DPS as affl cause mobs die pretty fast in 5 man instances. But watching threat and not wiping your group on big things like 10+ is important. In a 5 man i find myself as affl sometimes just throwing out 1 or 2 dots and then SBing till mobs dead. I dont find myself doing lots of 5 man instances anymore though. I do the Daily H and thats about it.
I find myself doing more 10+ raids now. If you look at the fact that 10+ raids have 2 tanks thats 2 targets you can DoT at same time your dmg builds fast without causing a threat issue. I personally only use 4 DoTs then spam SB. I dont bother with immolate or the other fire spells.
On Boss Fights i sit around 120% threat or try to atleast. If you look at how long a boss fight can be and take into consideration everything from mana threat and maintaining a constant DPS Afflic wins. I never run out of mana and dont have to worry about theat to much.
In the End you are more useful to your group as an Affl lock over dest at end game. But if you can really watch your threat and have lots of money to spend on mana pots you can make Dest work to. Its like i read the other day on some forum, being the top DPS isnt the most important thing in a Raid. Its doing good dmg without putting the raid at risk.
For end game 5 man instances you probably wont be the top DPS as affl cause mobs die pretty fast in 5 man instances. But watching threat and not wiping your group on big things like 10+ is important. In a 5 man i find myself as affl sometimes just throwing out 1 or 2 dots and then SBing till mobs dead. I dont find myself doing lots of 5 man instances anymore though. I do the Daily H and thats about it.
I find myself doing more 10+ raids now. If you look at the fact that 10+ raids have 2 tanks thats 2 targets you can DoT at same time your dmg builds fast without causing a threat issue. I personally only use 4 DoTs then spam SB. I dont bother with immolate or the other fire spells.
On Boss Fights i sit around 120% threat or try to atleast. If you look at how long a boss fight can be and take into consideration everything from mana threat and maintaining a constant DPS Afflic wins. I never run out of mana and dont have to worry about theat to much.
In the End you are more useful to your group as an Affl lock over dest at end game. But if you can really watch your threat and have lots of money to spend on mana pots you can make Dest work to. Its like i read the other day on some forum, being the top DPS isnt the most important thing in a Raid. Its doing good dmg without putting the raid at risk.