My experience with those Conti tires is sidewall damage, kind of a nightmare on the road when you can't repair the tire.
A tight-fitting tire is actually a good thing, in case of a flat or blowout a tight-fitting tire is actually a lot better because the likelihood of it coming off the rim is a lot less, which really becomes important with a loaded bike.
If for some reason you need an emergency spare tire just to get you to a bike shop, then the Conti would be great for that since it is lightweight and will fold up; although you can take a beaded tire and twist into a figure 8 and store those as well.
Yes, Schwalbe Marathon tires are very tight fitting, but there are ways to make it somewhat easier to install. The first thing you need to do before putting on the tire is try putting talcum powder on the tube and bead of the tire; then make sure you use a very strong set of tire irons like the Lezyne Power Lever XL, these are impossible to break; then you need a second tool called the Kool Stop tire Bead Jack, that's right Jack, this thing works like a dream, instead of lifting the last section of the tire out away from the rim and up as a lever will do which all that does is make it more difficult, it slides it up alongside rim and then into the rim.
By the way, if the baby powder doesn't work, you can do a soapy solution and that will work better.
Kool Stop Bead Jack is the same principle as the VAR tire lever but it's made a lot stronger than the VAR, I have both of those levers, and while I never broke the VAR, had a feeling when using it on the Schwalbe Amotion tires that it could break, so instead of finding out, I ordered the Kool Stop. Problems with the Kool Stop; one is that it is longer than the VAR and thus won't fit into small or medium seat bags, but it will fit in longer ones, the VAR is shorter and has no problem fitting in any seat bag; the second problem is the side of the lever that goes on the edge of the rim was not made very deep, in fact, it is quite shallow and I had trouble keeping it on the edge, sort of strange the company did that and then over the years never corrected it, but I managed to get it to work, it just isn't ideal.