Hell no. The first one was meaningful, the last two weren't clutch shots in the face of dire circumstances.
Whereas Reggie's 3-HR game, his first one gave them the lead from being down by one, 2nd one increased their lead from 5-3 to 7-3, and the third made it 8-3, with the final score being 8-4. It was also a deciding Game 6, and last but not least, he didn't get 6 ABs like Pujols (thanks to his team scoring 16 runs), he got 3 ABs, total (after a 4-pitch walk his first time up).
As for the "Mr. October" thing, in 27 WS games Jackson hit .357/.457/.755 with 10 HR and 24 RBI. Pujols, in 12 games, has hit .310/.442/.667 with 4 HR and 8 RBI. Pujols has hit better in the LDS's and LCS's than Reggie did, but...
Sorry, Mr. Verducci and Mr. McGwire, I'll take Reggie Jackson here.