Seats per car and what that means for your group
With a price per vehicle, the cost per head falls with every seat you fill. A family of four or five fits into the Mount Fuji Discoveries car and would need two cars with Wonder land. A couple pays the full vehicle price on either tour, so for two people the comparison with a minivan tour with nine seats is worth making.
Your driver is your guide
On both tours one person drives and explains. Wonder land calls the tour guided, but in practice the driver is the guide, and reviewers say as much. Mount Fuji Discoveries describes an English-speaking driver from the start. Expect directions, timing and local tips rather than a running commentary on history. In exchange you get the flexibility a coach cannot offer: when the summit is in cloud in the morning, you can go to Hakone first and come back to the lakes in the afternoon, or stay longer at the one viewpoint where the mountain shows. Wonder land reviewers describe drivers who moved the start forward to get ahead of the traffic, in one case to a quarter to six. Ask about the pickup time when you agree the route.
What the price covers
Mount Fuji Discoveries includes tolls and parking, which on a long motorway day are not a small item. Wonder land lists entrance fees and meals as extra and does not mention tolls on its product page, so ask before you book. On both tours, plan to pay for lunch, the Lake Ashi boat and any entrance tickets on the spot, and carry cash for it.
Agree the route before the day
Send the driver your list of must-see stops and your latest return time when you book. Lake Kawaguchi lies on the north side of the mountain and Hakone to the south-east, and every extra area adds driving time. Two areas and a fixed time back at the hotel make a plan the driver can keep.
The 5th Station and bad weather
Mount Fuji Discoveries has the clearest rule on this site for the 5th Station: if the road is closed, you choose between a full refund and other stops. From about December to early April that question comes up often, because snow and ice close the Fuji Subaru Line. Wonder land runs in any weather and does not name a rule for a closed 5th Station. Cloud is never a reason for a refund, on either tour. The free cancellation before the deadline on the booking page is what protects you, and the weather and cancellation rules are listed for each tour on a separate page.
Pickup areas
Mount Fuji Discoveries collects you at hotels in Tokyo and Saitama, Wonder land in Tokyo, Ueno and Yokohama. If you stay in Yokohama, Wonder land is the one that covers you; north of Tokyo in Saitama, it is Mount Fuji Discoveries. The planned duration on both is 10 to 11 hours door to door.
When a coach tour is the better choice
Travelling alone or as a couple on a budget, a coach or minivan tour costs a fraction of a private car. The same goes for anyone who wants a guide who only talks and never drives. The tour finder sorts every Fuji day trip on this site by situation.