I am going to the US in the next couple weeks and want to buy a flash unit for my Panasonic FZ150. I rarely use flash and the camera has a small pop-up flash. However, I recently lost some good shots at a folk event that went well into the evening (an native celebrant setting his costume on fire and running wildly through the spectators and photogs - no injuries, just part of the festival).
Anyway, I am torn between the Panasonic DMW-FL360 ($220) and a Vivitar ($160) made for the FZ150. I used to have a Vivitar for my 35 mm. Nikon and it was great. The Panasonic only takes two batteries and it may be slower to charge.
Any words of wisdom?