TACTICAL WALL POST, INCOMING!
Well, I own both classes, and allow me to explain to you how each class works in a nutshell.
Though TWO things are needed for BOTH classes: The ability to learn from your mistakes and decency at pvp.
Naz-gul: You may have heard that it is SUPER OP AND DOESN'T NEED ANY SKILLS. Those people either are just Ragers, or people who bought it and just want to brag how good it is, truth is, you need skills for it, Naz-gul is very hard to master, but pays off amazingly if you do master it, I'm not scared to say it, but I average only 5+ kills with it, though it may be on Minas Morgul, Minas Tirith, and Osgiliath, let's take this into account, It has 2 ways to kill a person, hitting them off the edge with a sword, or grabbing them and dropping them and killing by fall damage, Grabbing is risky, you want almost no one near them, and you want to make sure of a couple things, first, Spearman or mage are a no-no, and that if anyone is really close by and looking at them, you're in for some damage, usually, you want to be careful with this, its risky, and its usually the reason most naz-gul die, by grabbing people and then messing up on flying up, if you master it, you can get 20+ killstreaks with it easily, now, the second one is the less risky one, but requires one of two conditions, that is either they are standing on a ledge where they will fall to their deaths by fall damage, or fall into water and die, hardly anyone uses the sword unless there is an archer or mage standing on a ledge, good reason to, as you CANNOT take hits, its painful to take 3+ hits, its less risky, but requires some very exact conditions, Overall, if you are good at pvp, and take the time to play it and Master it, it is worth its weight in gold
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Balrog: Now, allow me to state a couple things, as stated above, you need to be decent at pvp, or it won't work, think of this as an Armored troll, but better, This thing was MADE to take hits, its invulnerable to arrows, and is probably the opposite of Naz-gul, whereas Naz-gul is supposed to 1-shot or deal lots of Damage, it can't take lots of damage, while with Balrog, though it can deal lots of damage, enemies are lucky if they even do a heart of damage to you, its usually half a heart of damage, and you regenerate health, here, you WANT to have voter sharpness on, if enemies are teaming you, you can take on probably 4+ If you are good at pvp, I got a killstreak of 23 on this, just juggernauting from the 21st hall to Balin's tomb, The whip of fire, its not much, its not a good ranged weapon, it just sets enemies on fire and knocks them back a little, the sword can do sharpness 1 diamond sword damage, here, the ability to pvp is more important, if you are amazing at pvp, you're almost unstoppable with this class, unless the entire dwarven team teams up on ONLY you, if 2 balrogs are teaming, forget about not taking the 21st hall, Pesky archers getting you down? Well this class takes ZERO damage from arrows! It also takes hardly any knockback! Though this class is only useable in certain parts of only 1 map, it is great at getting good killstreaks, as long as you are decent at pvp, this will supply you with everything you need, allowing you to
achieve decently high killstreaks, if your team is sluggish at capturing Balin's tomb or the 21st hall, this is the best class ever, you can get high killstreaks as long as you remember to take a break to regenerate your health, in the right hands, this class is the best class anyone can think of.
In a nutshell, both a great classes, if you are a VERY fast learner and are devoted to EW and devoted to getting good, though you aren't that great in pvp, get Naz-gul, and learn how to use it. If you are good at pvp and know your way around the 21st hall and Balin's tomb, and are pretty active, get Balrog. Though one is 5,000 points cheaper, it is only used in certain parts of 1 map, while the other one costs 5,000 more points, and requires a level of learning, but is accessible in 3 map. In the end, its all up to you.