I am not aware of which brands are available in your country but don't let the specs you list be a guide. Subwoofer power ratings are not measured equally so just as in car stereo the power specification can be off by a mile. An expensive 10" woofer may may louder and better than a cheap 15" driver.
Both of these specifications do relate to how loud the subwoofer might play. Assuming that this is your goal it will depend on the room size. Too large a woofer might overload a room and be boomy. You only need enough power for the sub to play as loud as it needs to. Neither relates directly to the quality of bass.