Spindash beats pretty much everything Samus shoots at you besides Zair and fully charged shot (and from a high angle, spindash can still win apparently).
Getting off of platforms with Sonic.... Platform dropping OoS is a tough technique to master, especially when you factor in hitlag and shield stun. Sometimes the easiest and safest option is to just jump OoS or Spring OoS, but until you actually reach level ground to below your opponent, you are just delaying the problem.
Getting off of platforms with Sonic.... Platform dropping OoS is a tough technique to master, especially when you factor in hitlag and shield stun. Sometimes the easiest and safest option is to just jump OoS or Spring OoS, but until you actually reach level ground to below your opponent, you are just delaying the problem.