Yes they blink if they are on a blinking circuit . Benefits of leds are less heat, brighter, longevity and if color is a preference I personally like the look of the white.
What I did was buy the $6.95 ones for the back lighting (6 bulbs) and buy the .99 cent ones for the turn signals, brights, batt, engine Ect that's what I did. I just wanted the least amount of heat and never wanted to tear the dash out again to replace a burnt out bulb that's why I went with all led.
always choose the largest beam angle. That means the light is projected in that direction. Example 90 beam angle will be a more direct beam of light than a 180which will be more of a well rounded light projection