I don't think one is better or worse than the other when it comes to making beer, but there are trade offs. I'm a 3 tier guy, since I was already invested.
Since I have two burners, I can heat up my strike/sparge water separately which is much faster than a single vessel full volume BIAB. I have done BIAB a couple of times and just didn't like the fact of lifting a heavy sticky bag of grains out of my boil kettle, squeeze and drain, while I could just pump the wort from the tun to my boil kettle and never touch anything except a switch. Cleaning is no different as I have everything done between the hot break and flame out. The only thing left to clean is the boil kettle and spoon...just like BIAB.
That being said, my top tier does take up a ton of space. It costs a lot more too, especially if you add in the cost of my kettles. I think BIAB's biggest attribute is cost saving and storage space.
Since I have two burners, I can heat up my strike/sparge water separately which is much faster than a single vessel full volume BIAB. I have done BIAB a couple of times and just didn't like the fact of lifting a heavy sticky bag of grains out of my boil kettle, squeeze and drain, while I could just pump the wort from the tun to my boil kettle and never touch anything except a switch. Cleaning is no different as I have everything done between the hot break and flame out. The only thing left to clean is the boil kettle and spoon...just like BIAB.
That being said, my top tier does take up a ton of space. It costs a lot more too, especially if you add in the cost of my kettles. I think BIAB's biggest attribute is cost saving and storage space.