Gosh...there's quite a range there. I can only really speak about the middle three (I haven't heard anything good about the latter so personally for me it would be struck straight off my list).
The Mura wins my award for the most comfortable seat for a child ever - absolutely gorgeous. BUT it didn't last here very long - and boy I was torn about selling it - because the fold is too large for me. The chassis is large folded, the seat unit is like having a large car seat that wont sit anywhere sensible. The back wheels are very wide apart and the basket has very poor access. All round although I adored the seat, the chassis / fold / basket wasn't working for us. It was a reluctant sale because the children looked soooo comfy though.
The Buzz - this has the same affliction of wide tyres. I took mine out this week and in the end had to switch to a narrower pushchair. I couldn't get it into two shops that I needed to go in (mainly because they had things on this steps and inside the shop on the floor). I have had issues with the front wheel getting stuck coming off kerbs or steps and having to wiggle it straight again. The basket and Buzz box look fab but I can only just get my handbag into the Buzz basket and even then its practically scraping the floor. The Buzz box would be handy as a changing bag but its getting filthy and scraped when folding. The two seat units are great. But I dont like not having a footrest suitable for a bare footed baby - the plastic with a gap above it isn't great.
Both of these two felt fab to steer and push, mainly because of the huge air tyres. But both of these leave me reaching for a narrower pushchair. But whether you ever need to depends on where you go and what you do.
The Oyster meanwhile has to be one of the best little pushchairs on the market. For the money you get top spec, jam packed with features, a narrow pushchair. It folds with the seat on in both directions. A large accessibly basket, the choice of colours etc. I am not convinced about the hood when its pushed back, but its huge when open. I also am not convinced of the seating position of the child - but you are unlikely to notice until the child is say 2, and by then you wouldn't notice anyway!! It would be the norm. Its easy to fold and open. Its a bit of a chunk folded when outward facing, but its neat and light to carry.
Out of these three, the Oyster really is the most practical with the best spec. I dont have air tyres on mine, but believe me it will one day!!