I own a Jackson RR3 and I play metal (not brutal stuffs like death, but only power, heavy and some trash) and hard rock. Should I sell it to buy an Ibanez XPT700? Which guitar is better, in your opinion? RR3 or XPT?

Edge III = no, but the guitar is good.
but if your willing to replace the edge III for a better trem like an OFR, that's good.
Ibanez RG321MH (Air Classic/Tone Zone)
Fernandes Telecaster (Twang King/stock bridge pickup)
Blackstar HT-20 (Scumback 55 speaker/ Tung Sol tubes)
TC Electronic Nova Repeater
Lava Cables Clear Connect, Soar and Mini ELC
I'd keep the Jackson, I tried the Ibanez just the other day and was not very impressed, it made me go "meh". Not saying it's a bad guitar at all, but I swear by the Jackson's I own.