Dak has been slightly better than Allen in their careers as a passer and Josh slightly better as a runner but overall they are very similar.
Josh had a better playoff run and has risen in hearts and minds because of it but hasn't been better than Dak for any consistent stretch aside from the year Dak broke his ankle and Josh shined.
They've both made two Pro Bowls.
Dak has a higher Quarterback rating but slightly lower QBR.
Josh is now seeing some of the weapons and overall team talent dissipate around him while Dak has never seen the team nor himself put it all together for any real playoff run.
Dallas still has a couple holes but right now you'd probably say on paper Dallas is better for the first time in 3-4 years.