Honestly, I've always wondered why people switch from a disc they know and love when their only goal is to switch brands. If you love tee birds, why switch because you want your bag to be a different brand? The answer to "what flies like a tee bird" is "a tee bird". If there is another compelling reason to switch (for example, this summer I fell in love with the plastic that Lat 64 uses. It's grip and feel provided me a compelling reason to switch most of my bag over to a combination of their 3 brands. Not for the brand, but for the grip and the plastic.) then go for it.
That said, my favorite disc for the last many years was the OLF. I've found a suitable replacement in the Trespass. My beloved buzzz's were replaced by Truths. I'd say right now, though, that if the OLF and the Buzzz were issued in Opto plastic, I'd go back to those molds right away. For me, the plastic, not the brand, was a reasonable reason to switch.