I've had the privilege of starting my training in a bolkow junior and then moved onto a SA bulldog just as I was reaching first solo level in the bolkow (aircraft was becoming permanently unavailable). A couple of weeks ago I did an unexpected set of circuits in a pa28 (I was just there to watch but I'm not going to say no to "would you like a go") and was able to transfer what I'd learnt to fly for some ok (far from perfect) circuits.
Did first solo yesterday in bulldog
I found the bolkow not great ergonomically but great visibility and I learnt to be very careful as it's a fairly fragile aircraft. Also wouldn't be good if you are large as the cockpit is quite cramped! Great fun but nowhere near as much fun as the bulldog which is more complex with its constant speed prop and injection engine but also aerobatic capable...
Compared to both, pa28 felt sluggish, especially in roll,with poorer visibility. I'm told they are pretty much indestructable and I'd like those extra seats in the back...