I haven't played a Serek, though hear only very good things. I have owned a couple of Wilcocks. Both superb basses and Viv Wilcock is building some outstanding instruments. I only sold mine as I prefer active basses (I think this is something that Viv now offers). My personal favourite short-scale is the US Spector Shorty. I think that there were only around 40 built (and I suspect it's a discontinued model), though one with lots of variations in terms of finish and electronics. They appear rarely but well worth a look if you see one. There's the European built Spector Bantam and it's fairly similar to the Shorty - I haven't owned one, but I'd imagine that build quality will be superb. Another favourite is the Alembic small-bodied short-scale (Stanley Clarke and other options) - weird ergonomics and not cheap but, as one would expect, extraordinary instruments. We're fortunate to have some great builders in the UK and beyond taking short-scale very seriously.