The difference in the lights is the quality. The 3528 led strip are poorly made less light output. Also, the cheap ones are a lower waterproof rating. The listing is IP68 which is made to operate under water. With the poor quality light strip if water gets in they will short out a blow the fuse on your truck..
I installed these LED lights on my truck they look awesome. They are amazingly bright. This is the link to where I purchased them,
http://www.ebay.com/itm/181689175453?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1558.l2649
I installed white LED running boards lights today. They come on when my dome lights are on and really light up my running boards. I purchased them from ebay. The listing says that they are 100% waterproof. I installed them in about 30 mins. This is the link..
.http://www.ebay.com/itm/181689175453?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1555.l2649
They really accent the truck.