Not familiar with either bike tour operator.
Which areas of North America do you especially would like to see?
Trip described to Vancouver Island area including Saltspring, Sunshine coast looks good. Yes, we've done some multi-day touring, etc. and short trips several times to different destinations in the area. This area is best June to Sept. in terms of more sunshine or lack of rain. The climate would be wonderfully temperate for you. Never gets blistering hot. Beautiful views of ocean, mountains, coastline, islands, etc.
Actually now that we have an additional new rapid transit rail line, you could easily get on directly from Vancouver airport and get off at a station (Bridgeport) and take 620 bus, throw bike on bike rack and it will take you directly to Taswassen ferry dock yourself instead of figuring out as a visitor how to cycle to the ferry docks with gear.
This will get around the problem of the other alternative, is finding as a visitor, where there is bike shuttle in Richmond, B.C. to take you through the George Massey tunnel which is forbidden to cyclists.