The person with the 30 lb bike will have the advantage because they will have saved US$5000 or so.
The heavier you are the more efficiency of the components is important as percentage wise knocking a few pounds off a 200 lb package does not change much.
2000 Montague CX, I do not recommend it, but still ride it.
Strida 3, I recommend it for rides < 10mi wo steep hills.
2006 Rowbike 720 Sport, I recommend it as an exercise bike.
1996 Birdy, Recommend.
Wieleder CARiBIKE (folding), decent frame.