SDS200, no contest. I have both BCD436HP and SDS100, and I can tell you that the 436 is simply not equipped for P25 simulcast. Yes, the price is much more, but the frustration that you won't be experiencing is worth it.
Make that THREE votes for SDS series. Simply put, nothing else compares to the performance of the SDS100 and SDS200 series of scanners on the Sarasota-Manatee P25 system. Memory size, programming ease and flexibility, massive color display size and customization, sensitivity and audio all excel.
My 436 works good and picks up the Manatee/Sarasota P25 system without any problems. My location in Lakewood Ranch is close to one of the system's transmission towers (located at SR70 and Lorraine) which helps. However, if I had to start over, I'd go with one of the SDS models for the reasons noted above.