Where in Canada? It's a truly enormous country and moving to Toronto is a very different proposition to moving to rural Saskatchewan. I moved to Calgary, Alberta from the UK in 2018 and overall I love it here but there are definite pluses and minuses. Have you checked to see if you're eligible to move here? It has been made more difficult in recent years. I got sponsored by a Canadian citizen and was then able to apply for a work permit from within Canada but it was still a lengthy and expensive process.
Life here varies hugely depending on where you are, but much of the country is extremely cold in winter, and 'winter' lasts for around 7 months of the year. Where I am it basically snows from the beginning of October through to May, and regularly gets below -30. I saw on Instagram that there has been a heavy snow dump today in the mountains near Banff, which is just over an hour from here. The coastal provinces - The Maritimes in the east and coastal B.C. in the west, have milder, wetter climates, but still much more 'extreme' than the UK.
The cost of living in Canada is very high. Property prices in Toronto and Vancouver are astronomical. There are cheaper areas but they may well be cheap because they're in the middle of nowhere, and Canada being the size it is, the middle of nowhere really is just that. Petrol is cheap but car insurance is very expensive, as are mobile phone contracts, Internet, cable etc. Food is extremely expensive unless you want to eat a lot of processed crap. Fresh food like fruit, vegetables and cheese is easily 3x the cost of the UK. Supermarkets don't have anything like the same selection either, there's nothing like M&S or Waitrose here (or Lidl/Aldi).
On the good side though - it is beautiful, or at least parts of it are! Other parts are enormous swathes of nothingness. The beautiful parts are heart-searingly gorgeous though. The people are by and large lovely, although tend to keep themselves to themselves (at least where we are). Shops stay open until 9-10pm during the week (pre/post Covid) which I love. There's an insane choice of take-out type food, some very healthy and some not so much.
It's a country you'll really get the most from if you're outdoorsy, unless perhaps you live in Toronto which is by far the largest and most cosmopolitan city, or Montreal. There are endless amazing opportunities for hiking, camping, skiing, skating etc. Bear in mind the wildlife though - no pun intended - when hiking in summer bear spray (super concentrated pepper spray) is essential because bears are found pretty much everywhere. There are also cougars, lynx, wolves, coyotes, skunks, moose, elk, rattlesnakes etc. and not just in the mountains or the backcountry, I've seen black bears, moose, elk, coyotes and bobcats in various parts of Calgary. It's very different to the UK, much wilder. I think it's amazing but some of my UK friends and family have been very perturbed by the prospect of coming across bears when out walking and having to carry bear spray etc.
Ice hockey (just 'hockey' here) is like religion - I love it! The other big sports are baseball and basketball but hockey is king. Calgary is definitely not the most culturally exciting place if that is your thing, and tbh many places are similar, but other cities are better in that regard.
I can't comment on schools as I don't have children, but in general from what I know from friends and other expats, provision/quality can be patchy and overall education in the UK is better. I think the more generalised/flexible university system here is good though - whereby you don't have to choose a specialism before you actually get there.
Hope this helps a bit, if you have any specific questions I'm happy to answer if I can!