Shadowmourne or Glorenzelg?

Hey there DK's, was wondering if Shadowmourne is worth getting over Glorenzelg for Unholy PvP build, or even DK in general/all specs.

I main Unholy for now and I'm loving it. Going for this build: http://forum.warmane.com/showthread.php?t=316091

I mainly do BG's atm, but I plan to do Arenas in the future (probably casualy doing 2s)

Also planning to get 2nd spec, so if anyone has a suggestion for what could be fun in BG's pls write. :)

So, without looking at the price differance, the main question is how much DMG would I lose (if possible in %) not having it, considering DK as a whole or just Unholy. I was searching around for the answer but only found a lot of mixed messages, some say it's just a little bonus and some that it's pretty much a must have. Just remember it's mostly for BG's and I guess Wpvp.

Sorry if some of this is basic knowledge but I'm a Casual Retail player returning after a long time so I don't remember much.

Thanks :D

Since this is burst meta, shadowmourne all the way. There is a reason why everyone runs with it and not glorenzelg, but if you wanna save coins then take glorenzelg. Percentage wise, idk how much but maybe 15-20% better in my opinion, coz aoe dmg and strength buff are op. 270 strength and 2k aoe blast is NOT a little bonus

This is damage increase with 100 extra strength without kings or fallen crusader ignoring resilience:

Deathcoil: 82 dmg
Gargoyle: 1407 total dmg
Frost Fever: 143 total dmg
Blood Plague: 187 total dmg

To calculate % difference I would need to know your stats.

Bryntroll is better than Glorenzelg.