Strong flavors? This is my forte, if you will.
Halo's so-called "tobaccos," except Turkish, Tiki, HX3, Freedom Juice, and Midnight Apple. I do not get any tobacco flavor from Halo's tobaccos, but I like the flavors a lot. They are certainly strong and distinctive.
Want2Vape's London, Louisville, The Blond, maybe Paris (if you can change coils frequently). My favorites are The Blond (cigar) and Louisville (pipe) - real tobacco flavors, arguably the best tobacco flavors currently available.
Also, 555.5 - it is sweet, maybe too sweet for some, but it is like vaping French muscat wine. I like it.
Ahlusion's Blue Grass Burley. I do not know if I would describe it as a strong juice, but unlike many other tobaccos, it has a distinctive and memorable flavor that I happened to like. Devil Dog and Mountain Oak Vapors' Apache are very close to each other, in my opinion, and both are similar to London and Louisville, but Louisville's flavor is more intricate.
Vape Dudes' American Standard, if you happened to like burned maple flavor. It is not as strong as Halo's juices, but I like it.
Roar Vapor's Strapple - it is a sweet juice, but the flavor is strong and memorable.
I think the above juices have a pretty good range of flavors to get started.