The latest accounts (2019/20) have:
PNE wage bill - £20.47m (80 players/coaches, 33 admin/sales staff)
Brentford wage bill - £25.86m (101 players/coaches, 70 admin/sales staff)
PNE 2020 wage bill was up £700k compared to 2019 (4%), but the number of players/coaches was down by 2, other staff unchanged.
Brentford 2020 wage bill was up £7m on 2019 (37%), but the number of players/coaches was also up by 16 (18%), other staff up by 18 (35%).
In fact, in 2018/19, our wage bill had been higher than theirs, even though they employed 3 more players/coaches and 19 more other staff than us back then. We do seem to like overpaying for what we get.
And of course Brentford were in the process of making back-to-back £25m+ profits on their player sales for 2018 thru 2020, while we made £7m total in the same 2-year period (on Callum Robinson).
Brentford haven't blown us away on wages or turnover - they have blown us away on player recruitment and trading, where we have proved to be absolutely light years behind.