Measuring 5mm x 5mm, the 5050 SMD is larger than the 3528 SMD.
These dimensions mean that each 5050 SMD is big enough to house four separate LED chips (sometimes called ‘quad LEDs’).
5050 LED chips are often used on 60 LED-per-metre strip lights, pulling 14.4 watts at 12 volts (commonly called 14.4w p/m or 15w p/m LED tape).
With an output of around 990-1080 lumens per metre, depending on colour, this tape gives you a smooth, bright effect when shining onto a surface.