If you are going to test Apache at least use 2.4 in MPM-event mode so you are testing apples to apples.

Using Apache 2.2 in worker mode is like comparing 8 year old tech to modern code.

hint: Apache is still about 15-20% slower than nginx even in it's fastest mpm-event mode, but it has many more years of features and modules available - it all depends what your needs are - single site services vs multi-site webhosting

You can always do the best of both worlds by proxying apache with nginx if you need both. Takes one evening to figure out.