Oh man, like the picture of the Star Trek crew battling the Star Wars crew, it's hard to say.
It seems to me like Borg's most well loved designs always have something borrowed: Jurassic Park has a similar layout to Whirlwind, TRON has a similar layout to Funhouse, Metallica has a similar layout to Monster Bash, Aerosmith has a similar layout to Medieval Madness.
There's nothing inherently wrong with that either. Each game still feels different from the inspiration it's drawn from, and thus still gives a unique experience, while still offering familiar gameplay and satisfying shots.
Steve Ritchie, IMHO has a longer track record of individually unique games. I think it's difficult to compare the two, as each is a product of their time. Games like ST:TTG, BK, HS (II), and more recently AC/DC are all highly praised games and hold tremendous gameplay value even years down the road.
Just for fun, out of the two designers, my vote goes to Pat Lawlor, even if his more recent endeavors with Stern have fallen a little bit behind the curve.