The difference between BW and Ti is the material of the casing (aluminium for BW and titanium for Ti IIRC).
MX980 pro:
Solid durable cable.
Straight/angle-shaped hybrid plug.
An acceptable sound.
MX980 contra:
Too much bass (well, unless you're basshead, then it is a pro for you).
Impossible to use while walking. The cable with all this metal parts is too heavy, and because of weird earphones shape (wedge beam) it literally pulls out the earphones from your ears on each step. That means that you either should rearrange/refit the earphones several times in a minute or after a half of minute the sound becomes inaudible and after another half of minute earphones will fall out from your ears.
Too uncomfortable in my ears (as if the earphones were too big - well, they are too thick, when compared to CM700); that makes their prolonged use difficult even in the home/office. And it is not because my ears are too small, or else CM700 would be also uncomfortable for me.
2x more expensive than CM700.
CM700 pro:
An awesome sound.
An awesome fit (really, using CM700 after MX980 is just a pure delight, even if we won't talk about the sound).
2x cheaper than MX980.
CM700 contra:
Fragile straight plug and fragile cable, which means that unless you're using these only on rare occasions, you will need to replace both plug and cable after a half of year or maybe earlier. That's the only reason i've purchased MX980: i had to ask someone to replace a plug of my CM700 a month after purchase (because i've used CM700 with an HDD players which have their socket on their bottom), to replace a cable another couple of month later (because, although i've used CM700 with care, the thread itself weakened inside of isolation), and then to ask someone to fix the connection between plug and cable every couple of month because i was unable to find someone who will make it strong enough to last for long.
Basically, as long as you're good with a soldering iron, i'd recommend you to purchase CM700 without a doubt. Otherwise, both CM700 and MX980 suffer from their respective grave shortcomings.