"Would "Instagram" be the prefered choice over "twitter"?"
Unless you're big fish and there's a large group of people that are seeking your business out, Facebook seems to throttle back on how much exposure your page gets with the hopes that you'll give in and pay out of pocket for some exposure. Some of the photographers I follow have commented on this and the consensus to make FB work as a marketing platform seems to be, either a)produce popular content on several social media platforms where people will seek you out and facebook won't throttle back, or b) pay facebook hard earned cash.
I have a Twitter account I almost never use. Whenever I log on to Twitter, it looks like complete chaos to me and I usually log off just as fast. I'll occasionally get the occasional email that someone I've never met is now following me on Twitter. I have no idea how that happens. If I had a business I was trying to promote, I'd spend equal time and energy on Twitter as I do on Facebook. Also, the modus operandi on Twitter seems to be to follow as many like minded people as possible with the hopes that they'll do the same. I realize how bizarre that sounds but that seems to be the deal.
I don't have an instagram account but I hear it's great for promoting a business. There are some strings attached.
http://www.cnet.com/news/instagram-says-it-now-has-the-right-to-sell-your-photos/
Edit to add: also keep in mind that for the most part, and relatively speaking, outdoorsy pages/channels/accounts/whathaveyous don't get a huge following in the sad little world of social media. Skurka for example, has fewer than 3,000 followers on YouTube and 8,000 on Facebook. I watched a sweet video last night of a guy who bikepacked from Alberta to Arizona. The video had fewer than 400 views.
Compare that to video games. My kid's a gamer and routinely watches sneak peek YouTube videos on soon to be released games. The gore du jour is the soon to be released Mortal Kombat X. Most of those channels have a half million subscribers or more and the videos are often times getting a million views. Assuming that these guys monetize their videos, not a bad extra source of income for them. I know one photographer who'll throw in some video game faff here and there. He may truly be into gaming but I suspect it's more to do with bringing viewers and clicks to his channel.
Don't really see a nexus between gaming and outdoor gear but diversifying the content of your page with other activities you're interested in probably wouldn't be the worst idea in the world.