j0ekerr: Do I need the first LBG to enjoy the second one?
Klumpen0815: Not really although you might wonder about a few things because the storyline is continuing.
I prefer the first one due to its consistent isometric perspective.
LBA2 desperately needs a hack that updates the perspective 30 times per second (hitting enter all the time does the trick too...). It only changes the perspective when you press enter to make it less demanding for the hardware, which has you constantly caring about choosing the right angles.
The troubles of early 3D games.
It might be because I played it first, but the second one is my favourite, although only by a little. It seemed like there was a lot more exploring and adventure. I actually liked the 3D environments, but I will admit the camera was terrible.