More important is intended use.

For cutting threads I'd recommend a better tap.

The tap grooves are called flutes. More is better for cutting. At work we have some spiral four flute taps which cut very aggressively, and do an amazing job, the removed metal comes out instrad of jamming up the tap, eliminateing the need to back up the tap every couple turns (normally done to 'break the chips'). Material makes a huge difference also, and for lubricant TAP MAGIC probably can't be beat .

For cleaning threads, fewer flutes seems better to me, especially on aluminum. Two flute taps seem more friendly to chasing threads, and less likely to try and cross thread. It's critical to start the tap carefully. ESPECIALLY ALUMINUM.

The cheapie sets are just fine for cleaning, probably better even.