Both time intervals are anaerobic, so do more anaerobic intervals.
Pyramid intervals are good -
here's a good discussion on intervals.
WRI - WaterRockets Intervals - are another option. Basically you go all-out, balls-to-the-wall, for one minute (or until you black out). Start off with a decent kicking sprint and just try to keep that wattage high. It will fade over the minute, but it definitely taxes your anaerobic system.
Depending on when the meat of your racing season starts, now may not be the best time to be focusing on anaerobic training though. This kind of peak power is the fastest to gain, and the fastest to lose.