Talk:Nasus/@comment-24947170-20141001062712/@comment-9048637-20141004225141

There are arguments for BT, Hydra and BotRK on Nasus. BT obviously gives you the most LS. That said, in a teamfight, Hydra will probably be better for sustain since it lets you splash your passive LS around the fight (not to mention the health regen). Of course, if the enemy team isn't like to bunch up, or if they've all got a lot of armour, that AoE LS won't be as effective. On a related note, consider LW if even the squishies have a fair amount of armour; again, this, in practical terms, makes your natural LS more effective.

BotRK, as Shinaliss noted, isn't really about the extra sustain, but rather the sticking power. That said, if sticking power is your main worry, Triforce or IBG are probably better options. Of course, you could get two of the three, but if you're only getting one, remember those two. (Triforce also gives you pretty good pushing power as well, which is another selling point of BotRK.)

And again as Shinaliss noted, you should generally only be considering any of these are your tanky and CDR options. Pen, as they say, is also nice, dending on how much armour the enemy team has (do remember that your E shreds armour, though, and that this will apply before %-pen).