I've tried nearly all the strawberry flavors. My favorite for realism, before MF's, was FA Strawberry (Red Touch) at 3-3.5% mixed with FA Juicy Strawberry at 1.75-2.5%. Combined they were very realistic, nothing artificial.
On ELR there were some folks who couldn't taste strawberry using the s-berry flavors most use in DIY. A few of those tried MF Strawberry, discovered they could taste s-berry again and really like it.
MF Strawberry is the most realistic IMO. It tastes like a juicy ripe California strawberry. I'm planning on doing a mix with MF and the two FA s-berries. It'll be a very simple 4 flavor mix with FLV Cream, as a test. Then I'll likely add either a cake or cookie flavor for a foundation. FW Yogurt would also work well for separate recipe.