(for the farm arrays track i'd guess you mean raindeer ride)
i cannot tell you what my one true favorite is because i have so freaking many
at one point i've listened to the ost so much that you could ask me what the name of pretty much any track is and i'd be able to tell you
there are so much tracks that i like i literally can't pick a favorite so have all of them
bio-engineering, industrial complex threat, shoreline threat, the captain, floes, white lizard, chimney canopy threat, kayava (duh), deep energy, grumblebum, glass arcs, speaking systems, rw7/rooftops, rw49/nest in metal
as for the downpour tracks, halcyon memories, train tunnels, downpour, landmarks, triptrap, waterfront facility threat, metropolis day threat (night too but not as much), frosted festival, trusted component, accidented condition, pipeyard threat, chillblain grace, outer expanse threat, sheer ice torrent, unused rubicon threat, rain, orange lizard, wandering cut, metal canopy, wired
also, rw23/beat and rw31/sub sub sub from the alphas