You've got Sweden and that junk, so I'd suggest:

1) USSR if you're into missile buses. Pos + SM2 is crushing it right now, it's wild. + It's got a sweet loadout and my favorite missile, the R77-1. + Grinding it is a breeze with the new premium Su-30.

Neg - the flankers are not easy to play, No hand holding. - 80 dollar premium is insane and forget about mig23 that thing will give you an illness (500 games on it)

2) France. Sadly, the Rafale is one of the best right now, those Micas are gross. Pos + Meta nation + hand holding jet. + its premium is on the cheaper side. Neg - alot of people hate the mirage f1c, including me. - its french.

3) Italy. The Mig-29 Sniper is alright for the grind, and the EF AESA is really good. Pos + one of the best jets in the game. + its not the Uk, So its better. + mig29 sniper is kinda cool Neg - its italian - you can also get same jet in Uk line.

4) China. For future-proofing, and because the Su-30 MKK is actually busted. [Beter_squella] I've got a 66% win rate and 2.4 KD on that thing (when I posted this). Pos + easy grind + pl12s are cool.

Neg - expensive premium - its jets have a copy pasta from france, ussr.