I can't believe anyone has chosen Lotus 3. It was horrendously slow (especially the mountain stages), lacked atmosphere, had some appalling level designs (completely random, so there was no diffiuclty curve within them), some poor design ideas (lap-based races against the clock especially, as you were just doing the exact same thing lap after lap), the new course designs were bland, and the 4-player mode was gone.
Lotus 2 is my favourite - fast, varied, smooth and exciting. the good thing about raicng against the clock was the late drama it triggered as you tried to beat the checkpoint. Lotus 1 is among the top 5 Amiga races as well in my book though.