Stylistically would it benefit lev more to have derke over aspas? We know at their maximum potential they're firepower are similar, but I'd argue derke is a better duelist(like entrying) than aspas but aspas is a better player(gun and movement)
aspas has a much better Neon, Derke has a much better Yoru
aspas is better at using snipers, Derke is better at using basically every other gun (not counting rifles and pistols)
aspas is better on defense (arguably), Derke is better on attack (arguably)
At the end of the day, they're both some of the best players of all time, and they each excel in their own fields. Which kind of player you want to pick up depends a lot on your playstyle (e.g. a faster pace team like PRX with big execs would go for Derke, a slower paced defaulty team like G2 would go for aspas)
i'd argue that, Lev had a mazino that showed looks of being one of the best in the world. Chronicle was really good this year, but throughout the entire year mazino looked better, and c0m looked better than boaster(i put c0m and boaster together because kinggg is leagues better at fragging and tbh lev's igling was miles better this year). I'd put Alfa over Tex but it's close and Kinggg was arguably a better fragger than Hiro/sick Leo.
The only time Mazino was superior to Chronicle was in stage 2 of the Americas. I say this as a fan of Lev, who watched all the games. There is no comparison between Leo and C0m, even Hiro had better stats (Stats don't summarize a player, but they are an important factor). Alfajer is better than Tex, that's undeniable. All the FNC players mentioned had an individually superior year, I can prove this with numbers. I averaged Kick Off, Stage 1, Stage 2 and Champions. I ignored the Masters:
Chronicle 1.18
Alfajer: 1.10
Hiro+Leo: 1.06
Mazino: 0.97
C0m: 0.96
Tex: 0.90
There were some errors while I was making this average, so there is definitely some margin for error, but it's not far from the truth. Remembering, stats do not define a player, but they are an important factor.
Add in boaster and kinggg now if you want to go to stats which would probably make those teams around the same overall. Not only that, but the level of competition in americas was far better than EU since EU was so top(pretty much just TH) heavy compared to americas which had around 5 teams that could've done something this year(G2, Sen. Lev. Kru, 100T). Also no reason to ignore the masters since they both made the same amount of tournaments this year. Stat wise all together these teams are neck and neck, but the level of play throughout their regions show lev had better players this year(not saying fnatic players aren't world class they just didn't work together as well compared to last year)
If I only add Kingg, the stats would be far from equal. Yes, it is an important factor, being impactful in most games. However, Leviatan's main factor has always been Aspas, who was MVP in 90% of the games. I didn't mention the Masters, because the only Masters they both participated in was the one in Shanghai, and Vlr doesn't offer a rating for this Masters. Your argument about EMEA being a weaker league is strong, but that doesn't justify such a strong difference in stats. Anyway, I can refute this argument with a fact, even in international events, FNC players had a higher average stats.
Mazino: Champions 0.95 rating, Masters 1.01 KD
C0m: Champions 0.98 rating, Masters 0.73 KD
Tex: Champions 0.88 rating, Masters 1.16 KD
Chronicle: Champions 1.21 rating, Masters 0.81 KD
Alfajer: Champions 1.09 rating, Masters 1.10 KD
Hiro/Leo: Champions 0.98 rating, Masters 1.01 KD
Alfajer is still better than Tex, Chronicle is still better than Mazino and Hiro/Leo is still better than C0m.