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 What TX-power-mode is the best?

TX-power-mode tells the wireless card which tx-power values should be used. By default this setting is set to default.

    default means that the card will use the tx-power values from the cards eeprom and will ignore the setting what is specified by the user in the tx-power field.
    card-rates means that for different data rates the tx-power is calculated according the cards transmit power algorithm from the cards eeprom and as an argument it takes tx-power value specified by the user.
    all-rates-fixed means that that the card will use one tx-power value for all data rates which is specified by the user in tx-power field. 

Note that it is not recommended to use 'all-rates-fixed' mode as the wireless card tx-power for the higher data rates is lower and by forcing to use the fixed tx-power rates also for the higher data rates might results the same problems like in the previous question about tx-power setting. For most of the cases if you want to change the tx-power settings it is recommended to use the tx-power-mode=card-rates and it is recommended to lower and not to raise tx-power.