It’s very difficult to advise at its very much personal choice and what you feel you can stick with.
I’d like to lose around 10 stone. In January I set myself a target to lose 6 stone this year and I’m just over 3 stone lost. I’ve done it by following SW and have done it myself without joining a group or subscribing online. I picked it because I know people who’ve done SW and so I knew a little of how it worked and then I bought the SW info from Ebay and started planning. It has really worked for me, although during lockdown, especially early on I wasn’t fully optimising as I couldn’t get fresh fruit and vegetables often enough so I now follow the principles of SW but I also monitor calories - helps with portion control particularly on free food. I’m sure WW is also good and I’ve heard positive things about the new WW.
So I think what I’m saying is pick one and you’ll adapt as you go along to what suits you. Mindset for me was about setting myself some long term goals but breaking it down to short term goals and working from one goal to the next - it doesn’t feel so overwhelming that way. I was also absolutely determined this time that I would lose weight and stick to it & I also made sure I could make slimming friendly versions of my favourite meals (which you’ll be able to do on either SW or WW) so I didn’t feel at all deprived.
Happy to answer any questions. Good luck to you