I’m roughly your same size, 5’6 155 lbs. I’ve been a fan of the Nike Pro Combat shorts for 10+ years now. I get them in a small, I’ve got a 28” waist.

NIKE Pro Core 2.0 6 Inch Compression Shorts https://www.amazon.com/dp/B008FPY8U0/ref=cm_sw_r_cp_api_glt_fabc_D2BYYX8GJST0PCMAKRA5

http://www.reddit.com/r/weightlifting/comments/2m6luw/your_favorite_underwear_brands_for_lifting_in/

That is a good post from a few days ago filled with comments about what people wear.

Here is my comment copied and pasted:

I have Hanes, Fruit of the Loom, and Kirkland Signature (Costco), and UA boxer briefs. The UA ones feel strange, so I dont wear them often. They are my "oops, forgot about that laundry thing" pair. I like Fruit of the loom most of the time and really like the Kirkland ones. They are the most....snug fit, which I find to be most comfortable. I should also admit that most of mine are probably a bit too large as I lost weight and the Kirkland ones are the only ones I bought after losing most of the weight.

As for compression gear, I normally wear Nike compression shorts.

I have a pair of Under Armour compression shorts that I do not like as much as the Nikes. They are a bit thicker, but I still wear them on occasion.

I have a few pairs of Athleta tights, but also have these and these and find both comfortable. The first link ones I find to be a bit thicker, which is really useful as it is colder now, but I didnt find them too thick and warm in the summer.

My brother and a few others I know have bought the cheap gear from Target (Champion I think), and that stuff seems decent, they find it comfortable. So that could be something else to try out.

I have Hanes, Fruit of the Loom, and Kirkland Signature (Costco), and UA boxer briefs. The UA ones feel strange, so I dont wear them often. They are my "oops, forgot about that laundry thing" pair. I like Fruit of the loom most of the time and really like the Kirkland ones. They are the most....snug fit, which I find to be most comfortable. I should also admit that most of mine are probably a bit too large as I lost weight and the Kirkland ones are the only ones I bought after losing most of the weight.

As for compression gear, I normally wear Nike compression shorts.

I have a pair of Under Armour compression shorts that I do not like as much as the Nikes. They are a bit thicker, but I still wear them on occasion.

I have a few pairs of Athleta tights, but also have these and these and find both comfortable. The first link ones I find to be a bit thicker, which is really useful as it is colder now, but I didnt find them too thick and warm in the summer.

My brother and a few others I know have bought the cheap gear from Target (Champion I think), and that stuff seems decent, they find it comfortable. So that could be something else to try out.