All those listed are constant voltage chargers/battery eliminators (fixed voltage listed)
5W is NOT always 5V << It must say 5V (a 5W, 5V charger is about 1A)
In addition, the 5.1 volt one is within the 5% tolerance (5V) common to computer chips in time of old (TTL, LSTTL). Since there is no such thing as a Negative Voltage DROP, 5.1V makes up for wire and connector losses, still with a safety margin
Current is how fast the charger (If allowed) can charge. If too low, the device may elect a 'slow mode' or just not Charge
Watts is just another way of specifying capacity I*E (Amps * Volts)
so, there is no problem using any of thos with a proper functioning device.*
Some devices (like Audio) Specify Peak Power. This is short bursts with a recovery time (cooling and power supply) in between. The number looks great in advertising
, but you will be dissatisfied (and possibly damage speakers) if you need more than the
Continuous Power rating.
BTW do not confuse INPUT Power (usually in VA). All devices are inefficient. You put more W in than you get out the lead (the rest is heat)
* don't get crazy over-sizing. If your device fails, the charger also limits to around that value (native over current limiting).