No safety ratings for either of these seats as the Maxi Cosi is too new and the Silver Cross is only available in the UK - the ratings tend to be EU-wide so they focus more on the seats available in multiple countries. However in general, Maxi Cosi has a good safety reputation. Silver cross less so.
We have the Joie 360 and it doesn't lock to the side - doesn't seem to be a problem putting them in. Recline on the go however has been useful several times. I don't think it matters too much about having to un-recline to turn it, as IME once they're asleep they are asleep. But if they fall asleep when it's upright and you keep driving, they tend to get head flop which looks uncomfortable/risky (apparently it's not risky in a baby over 6 months, but I don't like it.)
I would not worry too much about weight/height limits - all these seats are designed around the same sort of standard. It will be 18kg/105cm dependent on whether it's R44 approved or i-size approved. You could take a tape measure, and see which has the highest top harness slot/headrest height, if you like.
Yes, worth noting that tall/heavy kids will not get to age 4 as these seats advertise. They tend to fit until they about outgrow age 3-4 in clothing - by this age you should have some idea about whether they are going through clothes sizes slowly, quickly or about on time. Some of the non i-size ones IF they have a very long shell (e.g. Joie) will last you about six months more. But yes, if you're concerned you won't get much use out of a seat like this, you might like to look at car seats which go up to 25kg instead. These cost about the same as the seats you're looking at, but they will last you a good 2-3 years longer which might be better value for money if you are concerned your child will be too young to go into a booster when they outgrow the seat you're looking at now, and you don't have two DC and need 2x toddler seats at once (in which case you can simply stagger the seat types).
If you do want to look at 25kg seats:
Rear facing only:-
Axkid Move, Axkid Minikid
Britax Max-Way, Britax Multi-Tech, Britax Two Way Elite
Besafe izi Plus
Rear and forward facing:-
Diono Radian 5 (but it's a marmite love-or-hate car seat) both directions to 25kg, but about 6 months less by height than other 25kg seats.
Maxi Cosi Beryl (however, only RF up to 13kg)
Forward facing only:- (NOT recommended at age 1 - but just for info)
Joie Bold
Cozy n Safe Excalibur
All FF 25kg seats except the Beryl need top tether capability.