I feel like Hal and Barry seems to be the one most explored and it comes off fun. Nothing against Wally and John but I thought Wally bounced off every character he was paired with well. His friendship with John didn’t really stick out in any way to me. Never really paid to much attention to Wally/Kyle admittedly in Morrison’s run.
1. Hal Jordan/Barry Allen - as they are the classic and most recognized Green Lantern and Flash.
2. Allan Scott/Jay Garrick - the two are so welded to the hip they mind as well get married.
3. Kyle Rayner/Wally West - The classic mid/late 90's pairing
4. Hal Jordan/Wally West - I'm a huge fan of both characters
5. John Stewart/Wally West - I've never read a JLA comic with them paired, so I am only familiar with the cartoon, and I wasn't a fan of how either was protrayed (The cartoon started the whole John Stewart stiff marine personality that I find one dimensional)
Jesse Quick/Jade