The north shore/south shore battle will go on and on.
Personally i'm a fan of South shore's nightlife, but north shores skiing. You can't beat, Alpine Meadows on a powder day.
Here are MY opinions on the mountians in Tahoe/surrounding areas.
Heavenly, South shore Heavenly has some of the best parks in tahoe, their park crew is awesome and they have such a variety of features. The lines arn't long on sundays or weekdays and the vibe is chill. Oh powder days, They open Mott/Killabrew canyon along with Firebreak (or something like that, it's on the tip of my tounge) It's a huge backcountry area that is awesome.
TIPS FOR HEAVENLY If you go on the cali side, past the gondola, their is the cali lodge. Don't park on the bottom lots, their is almost an access road to the left of the lodge right to the left of the WORLD CUP lift, by the house's. You can ski to the lift and ski to your car with a walk of no more of 10 seconds.
http://www.skiheavenly.com/~/media/heavenly/files/trail%20map/1011_trailmap_lg.pdf
Kirkwood, Not on the lake A little further out from tahoe on the 88. but oh fucking god this moutain gets buckets of powder, their park isn't bad for spring days, but On the powder days it's insane. All i can stress about kirkwood is how awesome the guys are (true skibums) and how awesome the skiing is. I get a season pass here everyyear, usually here and Heavenly. Just because of the powder.
TIP you don't always need first chair, but the wall is amazing. Their is a cliff section that is to the right of the wall that is worldclass. POWDER POWDER
Sierra At Tahoe, More of in the middle, but i'll call it south shore This moutian is pretty cool, a lot of young park skiers, their parks are unique and have amazing flow. it's not flat so you get speed easy, I don't ski there very often but I do everynow and then And it's always a fun/good time. Don't have any tips as i don't go here enough.
Northstar, Truckee, north shore This moutian is the downfall of tahoe IMO. Very very very long lines, it's a tourist mountain, and well the lift lines can be 30 mins to an hour at sometimes. Their park is nice, but very flat so if you fall you don't have speed for anything else. The stash is pretty sick but last year they bolted the cabin up, so you couldn't even go inside it was lame. Northstar powder is 4/10. Very expensive and not worth it. The northstar pipe is awesome, this is the only thing i ride when at northstar. BUT to not die on the pipe, you have to hit it after about 2-3 days of bluebird.
TIPS don't go here.