Best aimt trainer for roller

Hello! Recently I hit diamond and i thought it was because of my aim but no it has primarily to do with decision makings and positioning after shit tons of vod reviewing, legitimately had an average of 500-700 damage on my games on the way to hitting diamond, and I know my aim will be an issue going forward up in the ranks

So my question is what is the best aim trainer for roller? Is it r5 or just playing tons of pubs and wildcards?