the Gohan and Goten duo have the edge imo. Trunks' gap on Goten is only so big while Goku still has the power disadvantage against Gohan in my opinion.
Chapa-o was confident in defeat Goku even knowing the power he used against him 3 years ago and he could even be expecting an improved Goku, therefore Chapa-o ( 23rd Budokai ) > Goku ( initially vs Chapa-o 22nd Budokai ). I generally have Kuririn ( 22nd Budokai ) at the same level as this initial Goku against Chapa-o, since they fought pretty evenly and I think Goku ( initially vs Kuririn ) = Goku ( vs Chapa-o ). Said that, Chapa-o ( 23rd Budokai ) should be at least > Kuririn ( 22nd Budokai ). Chapa-o would win.
Goku base ( vs Freeza ) vs Vegeta ( saga Mecha Freeza )
Vegeta, most likely. After being shown up severely by Freeza and the introduction of a Super Saiyan, I'd say he'd have trained enough to at least surpass initial 4th form Freeza.
I don't consider EoZ Base Goku/Vegeta that much higher than Innocent Boo; so with Base Goku not very close to his previous Super Saiyan 3 power, Gogeta wouldn't be either. Gohan-Boo stomps. Super Saiyan would be required to win in my opinion.
The gap between 18 and 17 is pretty small, but the fact that both of them never tire and that at FP they're both much stronger than Vegeta makes me lean towards 17's victory.