FrUK all the way. They've known each other for over a thousand years, fought in countless battles together (on opposing sides and the same side), grew up together, are on a pretty darn even maturity and intellectual level, and have endless amounts of respect for each other. They absolutely complete each other XD
I just freaking adore the pairing. It can be so deep and dynamic if explored properly. France is more than just a pervert, after all

I do love seeing America and Britain interact, but just as sweet family members. I like the pairing well enough in AU fics and whatnot, 'cause their personalities clash pretty adorably. But as far as canon goes, I just see them as family members.

I also have soft spots for France/Spain, America/Japan, Britian/Japan, Prussia/Hungary, and America/Lithuania.

I love and ship
GermanyxNItaly
SItalyxPrussia
SItalyxSpain
SwedenxFinland
DenmarkxNorway
FrUk
JapanxGreece
JapanxAmerica
LithuaniaxPoland
AustriaxHungary
PrussiaxHungary
PrussiaxAustria
RussiaxChina
AustriaxSwitzerland
BelarusxRussia
Holy Roman EmpirexChibitalia
SKoreaxChina
NetherlandsxBelgium
PrussiaxPrussia
CanadaxSeychelles
RomexGermania
SealandxLatvia
SwitzerlandxLiechtenstein

Spamano is my all time favorite. Just something about those two... they have a great dynamic~ =w=

Gerita is probably my next favorite pairing. Again just for their dynamic together. They're way too adorable~

Other favorites... Pruhun... HRE x Chibitalia...

I used to be more into USUK and Franada, but not so much now.

I'm getting more into het pairings using their Nyotalia versions too. So many options. @_@

FRUK FOREVER!

RusAme (Cold War FTW!)

GerIta

Spamano

Canada/America   (In that order!)

Prussia/Canada

That's all I can think of for right now...