giants good, but the OP did ask for best…
check out the first user review on mtbr for the Anthem X0:
“great suspension when combined with RP23, climbs very well though not as well as DWlink frames”
and you don’t get the RP23 with the X4.
“Not as stiff as others”
“there are weaknesses such as mentioned above and wide side to side flex at the rear triangle”
“The Mach 4 also pedals like a hardtail while this one needs the propedal on to be almost like a hardtail.”
Never put propedal on with the flux and it never bobs, even out of the saddle.
Frame weighs a lb more than the giant though, so the build will be more expensive for a light weight.
The Giant is outstanding for a cheaper build though.