Fallout: New Vegas:
Non-vanilla esms and esps specifically noted here are ones that are known to conflict - match the order here to resolve those conflicts.

FalloutNV.esm
DeadMoney.esm
HonestHearts.esm
OldWorldBlues.esm
LonesomeRoad.esm
GunRunnersArsenal.esm
CaravanPack.esm
ClassicPack.esm
MercenaryPack.esm
TribalPack.esm
YUP - Base Game + All DLC.esm (if being used, before PUP)
Unofficial Patch NVSE Plus.esp (if being used, before PUP)
PUPFNV.esm
[ - other mods - ]
Strip Lights Region Fix.esp (if being used, near the end)

Tale of Two Wastelands:
Non-vanilla esms and esps specifically noted here are ones that are known to conflict - match the order here to resolve those conflicts.

FalloutNV.esm
DeadMoney.esm
HonestHearts.esm
OldWorldBlues.esm
LonesomeRoad.esm
GunRunnersArsenal.esm
Fallout3.esm
Anchorage.esm
ThePitt.esm
BrokenSteel.esm
PointLookout.esm
Zeta.esm
CaravanPack.esm
ClassicPack.esm
MercenaryPack.esm
TribalPack.esm
TaleOfTwoWastelands.esm
YUPTTW.esm
NavmeshOverhaul.esm (if being used, before PUP)
NavmeshOverhaulTTWPatch.esm (if being used, before PUP)
PUPTTW.esm
[ - other mods - ]
TTW Quick Start.esp (if being used, after PUP)
[ - other mods - ]
Strip Lights Region Fix.esp (if being used, near the end)