Ground or shredded sirloin for your steak tartare? Please contact me if you would like to discuss an offer.
The second turbocharger would not come in to play unless the engine was under high throttle and the engine speed had attained 4,000rpm and above, it would then activate to maintain 10psi boost at that much higher engine speed up to the redline, with the second turbocharger effectively taking over the delivery of engine boost from 4,500rpm on up.
What you want is an engine build that serves your application and driving style.