Get Genelec if you want pure FR accuracy, although it Genelec has a slight reputation for honkiness.
Focal measures well FR-wide, but use of metal drivers for nearfield especially aluminum may cause some hearing fatigue over long listening sessions.
Dynaudio is generally regarded as smooth with a small bass bump, may be the easiest to listen to over long sessions although FR-wise might be least accurate.
A T-amp and an NHT Classic 3 or Ascend Sierra-1 or 2 would probably outperform any of them in pure measurements but would have less transient response due to crossover losses from passive design. The thing is the main cost of active speakers is the active crossovers, DSP, enclosure, and built-in amp; the drivers are usually much lower. Dynaudio for example uses the same drivers in their under $1000 speakers as their $5000 active AIR speakers, and the drivers in their passive flagships are miles ahead of their active brethren, but the flip side is less dynamic sound from say, a 6db/octave passive crossover vs a 100db+/octave active crossover and DSP.