Might be in the minority here but personally I think the Best helicopter LEGO ever made was the Dino Attack T-1 Typhoon. What do you consider the best one they made? :
LEGO 4403 Air Blazers Instructions, Make and Create
LEGO 4403 Air Blazers Set Parts Inventory and Instructions - LEGO Reference Guide
LEGO 4403 Air Blazers Instructions, Make and Create
Air Blazers : Set 4403-1 | BrickLink
LEGO 4403 Air Blazers Set Parts Inventory and Instructions - LEGO Reference Guide
LEGO® Employee Gift 4002019 Christmas X-Wing: instructions to build your own | New Elementary: LEGO® parts, sets and techniques
LEGO Dark Gray Plate 1 x 1 Round (6141) Comes In | Brick Owl - LEGO Marketplace
Lego Creator 4403 Air Blazers Helicopter – 100% Complete with Box + Instructions | #334361374
LEGO 4403 Air Blazers Instructions, Make and Create
LEGO 4403 Air Blazers Instructions, Make and Create
Lego Make and Create Set Air Blazers #4403 - YouTube
LEGO 4403 Air Blazers Set Parts Inventory and Instructions - LEGO Reference Guide
LEGO instructions - Creator - Designer Set - 4403 - Air Blazers - YouTube
LEGO 4403 Air Blazers Instructions, Make and Create