Google Trends Comparison - Which Keywords Would You Use?
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It depends on what's your page about. If you're selling Instagram, go for "Buy Instagram" - but I don't think it's the case

Don't look just on search volumes (attachment) but also on the most relevant keyword. If the user clicks on your page in SERP through _"Buy Instagram Views" _but you're selling "Likes", it's not gonna work and you'll get bad UX rate which is one of the ranking factors as well.
Focus on relevancy. However, if you're selling all of them (Likes, Followers and Views), go for the search volume (assuming you don't have 0 domain authority and any back links).
Hope it helps, Martin