Best to go with
If they have tanky team
Get this if u want.
Example build 1
Example build 2
Not Updated For Current Season
The spells i take for ADC are Heal Flash
Flash Is good for getting out of tight areas, fixing position, securing kills, dodging cc.
Barrier Is really nice if you are super aggressive in lane because it allows you to tank 2-3 auto attacks without effecting your actual health.