Stat wise, Laxus had 6s in defense, speed, and offense which is a clear indication of his superiority. Erza may give a good fight, but she'd probably lose in the End. Lets not forget that the reporter most likely doesn't know of Laxus' implanted Lachryma. If Laxus went dragon slayer on her, the gap would be farther, imo.
Still, firepower effectively cut in *half* by Lightning Empress. And the possibility of either Fairy Armor, or her all-magic-into-one-sword-blow attacks, which'd stand a chance of taking him out even if he overall outmatches.
I'd think it'd be like a 7-8 out of 10 fight for Laxus.
Which brings me to how much of a boost did Erza get from Ultear? She wasn't shown do be squirming in pain which to me indicates that she already had some access to her second origin.
I think she's just that badass ^^