A) Land at Heathrow at 13:15 on a Saturday, go through customs and take the Heathrow Express to Paddington and then the tube to Waterloo for a 17:45 Eurostar to Paris and arrive there at 22:00

OR

B) Not stress about it the first day, just stay in London the first night and catch a 10AM Eurostar to Paris arriving at 2pm.

If I had 4 months I wouldn’t be asking but I only have 15 days and will be skipping London purposely so that I can spend more time at the places I definitely want to go:
Paris, Zurich, Amsterdam, Belgium.

Please, what do you think? I think option A is feasible, time-wise, but I would dig your opinion…