I believe that is something that you can definitely argue. Hogan was a major draw in two companies and HHH was barely a draw in one. HHH's popularity from 1999-2000 was mainly a result of Stone Cold taking time off for surgery. HHH was a awful drawing champion from 2003-2005 and it took a good year-long reign from Cena for us to recover from that. Hogan will always have a lasting impact on the business and I have no idea what HHH's impact would be. I always felt he was kind of there and it took till 2001 for Austin to put him over somewhat.
I'm guessing you're talking about the whole fact "we can't argue that Triple H was the superior wrestler?" I'm not talking about drawing abilities, cause that's a clean Hulk Hogan win, I'm talking purely in-ring ability, where Hulk Hogan was incredibly limited, perhaps even worse than John Cena, who's constantly being belittled for his abilities in the ring, where as Triple H, while he's not the perfect in-ring wrestler, his move set exceeds Hulk Hogan's.
Triple H's impact on the business would, as I said, helping the business into the attitude era, and carrying a part of the company on his back (at least to my considerations, carrying RAW while the stars of Kurt Angle and Brock Lesnar was Smackdown material during the 2002 - 2005 time, Kurt Angle could've been on RAW during that time, I can't really remember, but matter is that Brock and Kurt was carrying Smackdown, Triple H in my eyes, carrying RAW) just like Shawn Michaels had to when talent was declining and moving to WCW.
Triple H on the other hand, has helped build some incredible stars that will prove to function very well in the business of tomorrow in Wrestling, guy's like John Cena, and Randy Orton, Randy mostly, and he's helped us move into a new era of new main eventers battling the 3 arguably biggest stars in the company, and now having battled Sheamus, a future star.
On the other hand, while Hogan certainly did build some stars here and there, he was ultimately from what I heard, a guy to put his own success over others, complaining about jobbing to wrestlers etc. that''s not the kind of impact I would want to have on my resume.
Triple H was put over just fine during the 99's and 2000's wrestling Mick Foley, wrestling The Rock, wrestling Austin, especially wrestling Foley proved that he could hang with the main eventers that wasn't Austin or The Rock, who they previously had paired him with for the sake of trying to build him, which I feel proved to be quite successful, Triple H was incredibly over as a heel back then, and we have to remember his incredible title defense at Wrestlemania 2000 (I believe that's the 16th? right?) which had him defeating two solid over the top beloved main eventers, and one giant who's proved himself to be a competition back then, before that, and after that.