Could the sequences in AoL be considered as trading sequences, or are they more fetch quests? For example, where you obtain the statue to bring back to the village in order to obtain new magic? I really enjoyed those "venture out to get one item in exchage for magic" missions.
I liked the one where you had to find the child on maze island. I just find it hilarious when Link finds him and holds him up, prideful, with a Lizalfos waiting to kill you.
Other than that, the only trading sequences that I've completed are those of OoT, TWW, and OoS. Out of those, I will not hesitate to say that OoT was easily my favorite one.
OoT's trading sequence was actually difficult. It was more than just here, you have this, give me something that I need to give to someone else, etc. You had time limits on the Odd Mushroom and Eyeball frog, and I'll admit, I had some trouble with the Odd Mushroom. Ocarina of Time's trading sequence just felt really complete in my opinion, and I had a lot of fun doing it. Plus, it had an awesome reward, the Biggoron Sword. A really fun sword to use, especially if you get it early and go through some dungeons with it.
Out of TWW and OoS, I liked TWW's trading sequence better. I thought it was real fun to take the time to go around, finding which Gorons gave you the better statue. Wasn't too challenging in a way that was fun, but was challenging in the sense that you had to go through the pain of finding which Goron to trade. Still, it wasn't too terribly irritating. At the end of the Trading Sequence, I thought it was cool to be able to plant those flowers around the town. Our reward here is just a Heart Piece, but it's not like it seems like it was all for nothing. Everybody likes Heart Pieces.
Then there's OoS. The reason I don't like this one as much is because it wasn't really for anything. It was for a tip on how to get the Noble Sword, and I could've just gone to a guide and checked on how to get it. Although, you do get the ability to buy potions about halfway through the Trading Sequence. The Trading Sequence wasn't particularly challenging if you knew where to go, but I still thought it was kind of fun. None of the trading sequences really disappointed me, but I was just kind of bummed that it was mostly for nothing.
I'm in the midst of LA's trading sequence, and I plan to eventually finish the rest of the Trading Sequences throughout the games. I'd like to see a trading sequence in a future Zelda game that is more like OoT's, where you have time limits and things that make it not so easy. But I'd like to also see new twists on the Trading Sequences, more than just added time limits, like other puzzles that you need to solve in order to get from item to item.