CLannad mostly pushes men's emotions to their limits.You're not a man if you haven't seen or cried while watching CLannad.
Hajime no Ippo itself has some moments where pushes men's emotions. One fight in particular made me and countless others pause the video and start throwing random punches in the air.
The fights really stir you up cause you see what everyone goes through to reach that point. So when someone loses or wins you can't help but react accordingly.
Clannad sounds good too, I'd really love to give it a try after I re-watch Hajime no Ippo.
But Clannad can't be compared to Hajime no Ippo, they're both different and stir your emotions differently.