Obligatory link to the stiffness chart - take into account whether the cup feels stiff or soft to you, as the chart doesn't reflect some recent changes (the fleurcups and white mooncups are softer, yuukis are stiffer) and there might have been different batches too. I *think* if you're not sure whether your cup is stiff or not, it is considered stiff. If it was soft your first impression would've been "aww, it's so soft!" :) Besides, stiffness is relative, as from what i know all reusable cups are softer than the rim of the Insteads, for example.
Remember, there's a distinction between leaks and overflow.
Bonus question, mostly because I'm curious really. As you know, MCUK, Fleurcup and Yuuki have changed the material while Meluna comes in classic and soft. Obviously, colour and stem don't matter for "identical".
To clarify, leaking "less" means you still leak with all cups you've tried, while "partially depends" means that you do have a goldilocks cup you don't leak with, but with other cups it does seem to depend on the stiffness how bad the leaks are. You can edit your answer here if you realize you should've picked another option instead.
Also, as long as you gave up on a cup for a reason other than leaks, it still counts for "i don't leak" :) Especially if you think you COULD make it work but it's too uncomfortable/doesn't have enough capacity anyway/whatever.
Sorry if this turned out too complicated :P Less serious business (ok, not serious at all), which cups have your friends/family members called pretty? :)))))))) Like, if they're not cup users themselves and/or are normally oblivious to cup beauty? For example, my medium glittery Meluna soft has been called pretty both by my mum (for whom they're a useful tool but nothing more) and by my friend who lost her interest really easily after not finding neither a ladycup nor a yuuki in Czech stores/pharmacies (so she could see them in real life first). Neither of them has called any other cup pretty but the glittery meluna got the honour:)