For me, it's all 5 of them
Seriously, I cant pick a "best" of all 5 of my Ibanezes. I love them all for different reasons.
Gio Ibanez (I sold it to a friend a few months ago). My first Ibanez. Yeah it was a gio but I loved the Beam blue color with the white pickguard.
RG350: My first RG. I think it's the odd man out if I get a new guitar later this year, but this 350 taught me the feeling that my guitars are like children, they each have their own personality and they are each very special.
RG1550. My first prestige (and first MIJ Ibanez). It has been my go to axe since I got it, I use it all the time, especially now since it's standard E tuning and my blue Gravity storms give it a nice 5xx series look
RG2550. I probably shouldn't have ordered this one when I did, but it is my main axe right now for Eb tuning. I have really come to love the stock pups and I'll keep it as is. Love the ghost sharktooth inlays
I got it directly from Hoshino's warehouse so I am the only one to have touched this guitar (outside the guitar shop workers when I needed something checked).
RG550: My first golden era 550. Candy apple to boot. Has some slight body damage but it's a wonderful axe. Got lucky that I found it
RG560: Luckily found this about 2 weeks after I got my 550. My first HSS guitar. Immediately turned it into my Andy Timmons guitar
Beautiful color and amazing playability. Like the neck more than my 550 actually.
As you can see, all of my guitars mean something to me for some reason and I can't pick just one as my "best" ngd