Raymond, I would stick with the EX11. I have owned both and they are somewhat similar with their tones. As a matter of fact, if I did not know what I was swinging, I could not distinguish the difference in the tone only. The Safari is faster than a Quattro, but it is still slower than an EX 11. Where the EX11 shines is the display. There is much more information that the Explorer screen provides. Is it deeper, not in my opinion. I find that I dig much less trash and more good coins with the EX11. If your EX 11 does not have a Pro coil, I highly recommend getting one.
When the Pro coil came out, there was lots of debate about how good it was compared to the slimline. I would not have any Explorer without a Pro coil.