I am a fan of the Sub channels... Less likely to have interference.
Agreed, but there are caveats...
Subchannels are not actually different frequencies. The subchannel is merely a squelch code that prohibits you from hearing anything on channel-X that does not have a matching "squelch code" or subchannel. Someone transmitting on Channel-7 with no subchannel selected, will walk right over your transmission on 7-7. So in that respect, subchannels are only good for reducing "chatter" or clutter. This also leads many people to believe they are having private conversations when in fact, anyone listening on their base channel# (subchannel-0) is hearing everything everybody transmits on that base channel.
There are some people with bike2bike that may not know how to tune their radios to a subchannel. It's been my experience that it's best to start out with no subchannel until you can get everyone on the same page, so to speak.
As everyone groups-up, splits-off and prepares to ride-away, each group can easily select whatever they want for bike2bike. I understood the question being raised as "Where should we all start?" more than "Where should we all end up?"
Channel-1 is full of every Walkie-Talkie sold. Channel-2 is full of every construction crew that doesn't want to talk to kids on Channel-1. Channel-3 is usually where things start to quieten down enough to make it practical in most areas. That's why I'm suggesting we start out on 3-0.