Im looking for the best armor/shield used by 1h/shield users.
Im looking for gear thats durable enough so I can feel like a tank, but also light enough so I can swing my sword fast.
Just so you know, shield weight has nothing to do with how fast you'll swing your sword. Shield speed on the other hand affects how fast you can block.
I'm guessing you're pretty new, (or you probably wouldn't be asking this) so if you're going to be on foot I would recommend one of the round shields. They have the best overall coverage. Assuming that, you have a few choices:
Elite Cavalry Shield - relatively durable, fast, 1 slot
Heavy Round Shield - pretty durable, moderate speed, 1 slot
Huscarl's Round Shield - really durable, moderately slow, 2 slots, great coverage
Steel shield - Super durable as long as you're not fighting an axe, super slow, 2 slots
A lot of the heaters and kites are good shields, but I didn't put them here because of their poor side coverage. Unless you know what you're doing, you'll find yourself getting hit around the sides a lot.
The weight of your armor
does reduce your WPF, but the amount will barely be noticeable with a 1-hander. WPF affects swing speed less with faster weapons. With heavier armor though you will take a hit on your movement speed, especially since you're already slow as hell because you have 5 athletics AND you're carrying a shield. So I'd wear armor that you think looks good and is around 11-15 in weight.