Help me decide: Grado Gold or AT440ML

For a few more dollars I use the AT ML150 on my Rega 300 arm and it is a super good sounding combo, I have a couple other carts.both coli and magnet from Clear Audio and Dynavector and have no reason to mess with the table.
(other catrs are Clear Audio Beta S and dyna 20L)

I think that someone should buy you a free cartridge just for being able to mount an RB300 on an XA. I can't tell you which cartridge is better, and I do own a AT440MLa, as well as an older Grado Signature 8MX and a Grado Black. I can give you a bit of information though. The AT is a much better tracking cartridge in the Rega arm, when correctly aligned, as is the Shure M97Xe. I would never, NEVER select the AT if I could not adjust the VTA of the arm. The line contact stylus is very, very finicky and needs to be aligned in all three planes exactly so. Unfortunately, incorrect alignment will cause the cartridge to be very bright, and some people complain of this, though I think that it is mostly a set-up issue. The Grado is much more forgiving of set-up vagaries as is the Shure. When correctly aligned, the AT has more detail and focus, but is lighter in the midbass, which is to be expected as Joe Grado was an opera fan. The highs are more detailed on the AT, as well, but they are not as natural as the Grado, not really bright, but a bit flat and lacking in natural bloom and air. If you need a richer, more bloomy sound, the Grado, don't look back. If you want more detail and focus, and don't mind playing around, then the AT is the ticket.

Thanks for the responses. It looks like the AT440MLa is a nice cartridge but I don't know if I can align the VTA on my Rega RB300 (by the way I did not install it, it was installed by Merrill Audio, I bought the whole unit on eBay. At the time it had a Nagatron 350E cartridge, which I never heard of, so I installed the Grado Gold.) I am still not sure which way I should go. I'm thinking! I'm thinking!

Frankly I use my TT for transcribing to other media, most of the time. I tried a wood body Grado and have an AT440 mounted right now. I thought the Grado sounded great, but it picked up hum from the TT and did not track on the inside track all that well for me, despite fiddling with it. The AT may not be as refined as the Grado, but I found it played inside tracks with alot less distortion than the Grado and no hum problems. But now I am bored and gonna try a MC cart.

This response might come a bit late, as the thread's a month old, but in that price range the Shure M97xE is worth looking into. Its tonal balance is warm when it's new but gradually takes on a well-balanced neutrality. Best of all, it's known (and justly) for its tracking ability. The Absolute Sound just made it an editors' pick. There's a well-written review of it on this site, too.