I tried a Weeride but didn’t get on with it, I found there was too much knee interference. Probably just a combination of rider and bike geometry, as plenty of folk get on fine with them, but worth bearing in mind. Might be worth seeing if anyone local on here can loan you one, or just let you fit it to your bike for a test ride up and down the street.
I ended up with a Yepp Mini, which was superb. JnrH mkII is due any day now so I’m hopeful it’ll be back in use in late 2016. The mount for the Yepp is hugely less intrusive than the Weeride mount, and you can buy a second mount for your other bike, then you can just clip the seat to whichever bike you are using.
For really young kids I’d be nervous about putting them in a trailer or rear seat. When they’re up front you can keep an eye on them, and monitor how much their heads are being wobbled about. I don’t want to re-open the can of worms regarding the safest age to start them in a child seat, but personally, IMHO etc, etc, 10 months seems too young to be out of your direct sight, unless they have a freakishly strong neck. For reference, I rode 5km to daycare with my son from 7½ months, so I’ve no problems with young kids on bikes!
Plus, when they are in a front seat they are right under your head so you can talk to them, point out interesting things etc, which I really liked.