I mean, as always it's important to make your own judgement based on your own calculations, but if it were me I would stick with the Flexi pass (I've never travelled with a continuous, personally).
Even if you fall into the youth category and buy a 2nd class pass in the current 20% off sale, the difference in price between a 15-day Flexi and a 2-month consecutive is a fairly substantial €164, which you'd struggle to spend on a spontaneous day trip even in Switzerland or the UK. But if several spontaneous day trips are likely you can divide that €164, and then compare whatever number you end up with against regular tickets from the relevant national rail operators' websites.
*Though I should add that the above argument, which must have been posted while I was writing my own comment, has given me pause for thought. There are a few extra journeys for which I won't use a pass on my upcoming trip this year, and it hadn't occurred to me to consider how I might plan differently if I wasn't so preoccupied with travel day value relative to standard tickets.
**I think it depends in part on what relaxed travel means to you as well. Both paradigms are valid. It might be relaxing to travel shorter distances more frequently, see more unusual places and have the freedom to venture out regularly from some of your fixed bases (Continuous), or alternatively it might be relaxing to take longer over each larger stop and have a fuller experience in the immediate area while being free of cumbersome luggage which can be left in your hotel room over multiple nights (Flexi).
