its no contest imo, especially if u only have one plant. make yourself a even canopy of buds and it will better utilize the light, basically it insures every top is exposed to light and is the same distance away so you dont get any popcorn buds and buds that are stretched reaching for the light cuz they are more shaded cuz the top cola or other budsites are blocking it. fim-lst-scrog are best used together, this is from a post of mine in another thread but i think it describes it fairly well so heres the post
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you should fim/or top/ or prune it for yield as soon as you can and use lst on the new tops. what i like to do is use both fimming/topping, lst, and scrog but if i only could use 1(or if flowering of course) i'd use lst, my previous post seemed like i was saying topping and fimming are always bad, which i did not intend it to. i fim a few times and tie the new tops down w/lst if im gonna do a scrog. in truth these methods work the best together. topping/fimming then lst the new growth points then just keep pushing them them under the screen till you have your screen filled and are ready to flower. best of luck"