Which airsoft gun should I buy?

AGM VSR10 Spring Airsoft Sniper Rifle $55
- Capacity: 25 Rounds
- 435 fps (0.2 g BB)
- 3 Point Sling & BB Speedloader Included
- One of the Fastest Spring Rifles On the Market

or

DE M58 Metal Airsoft Shotgun Shot Gun $25
- Pistol Grip
- Pump Action Shotgun Single Shot
- 420 fps (0.12g BB) / 330 fps (0.2 g BB)
- Capacity: 14 Rounds
- Adjustable Hop Up
- Metal Heat Shield
- Sling & BB Sped Loader Included

or

WELL VSR-10 Spring Airsoft Sniper Rifle $55
- Capacity: 30 Rounds
- 400 fps (0.2 g BB) / 200-250 feet
- Scope 3-9×40 Scope Included
- Integrated Metal RIS Rail
- Solid Upper Barrel and Body contruction
- BB Speed Loader & Sling Included

which would be the best in wars against one with a rifle and 3 with pistols?

is faster always better?
is a rifle better than a shotgun?
i am just worried about the capacity of bb’s will it be enough to take them out?