I got an Unusualifier!!!-Now what do I do with it?

[XS-Terrain]

Hey guys!
So, recently, I got a Bucking Bronco Unusualifier from an unboxing at the end of the Scream Fortress 2016 Event! But what should I do with it now?
Right now, on the Steam Community Market, it's selling for $125.75, but I could also making a listing on backpack.tf or tf2outpost.com for somewhere around 50 keys.

Considering that I'm not an Engie main and likely won't actually use this taunt and therefore this Unusualifier is worthless to me, what should I do with it? Tell me!
Option 1: Sell it on the Community Market for Steam Money, then buy Keys (the already Unusualified version sells for about $8 less, in case you're wondering).
Option 2: Sell it for Keys directly on a 3rd-party website, such as backpack.tf or tf2outpost.com.
Option 3: Hang on to the Unusualifier to see if its price will increase (or to see if I will become an Engie main lol).
Appreciate your feedback! Thanks in advance!

[Lia_Rein]

You definitely want to buy keys? When I unboxed an unusual I had it listed on the community market because I primarily wanted money but I also listed it on outpost. The problem with outpost is that lotsa scammers might try to add you and try and steal it off ya, so if you do that just be super aware
I prob wouldn't hang on to it if you won't use it yourself because I feel like the more people find, the lower the value

Also, congrats

[Balubish]

Cool another reason to spend more money in this game. If they only brought back Quickjoin ppl would actually start playing it again.

[Someone Special]

I'd say, if you're not going to apply it right now, it'll be good to sell it. Over time, it'll probably depreciate in value, but there is a chance it will witness an increase. I'd recommend just watching the markets and gathering some information on the current history of it so far.

[XS-Terrain]

Yeha, I'll probably just sell it on the Steam Market, don't have much inventory space anyways.