Read the two examples of couplets below:

My brother just sits around watching TV
I love the outdoors; that would never suit me.

My brother just sits around watching TV
But I like to hike and swim and be outdoors and stuff so that wouldn't be a good choice for me.

Both had two lines; both had the same rhyme. Which was better?

"Iambic meter is a two syllable pattern: 
da DUM, da DUM, da DUM

Shall I  / com pare  / thee to  / a sum / mer's day? 
Thou art  / more love / ly and  / more temperate: 
Rough winds /  do shake  / the darl / ing buds  / of May, 
And sum / mer's lease  / hath all  / too short  / a date
William Shakespeare

This is the most common meter in the English Language.   

Trochee meter is a two syllable pattern:  
DUM da, DUM da, DUM da

Ty ger, / Ty ger, / burn ing / bright 

In the / for ests / of the / night

What im / mort al / hand or / eye

could / frame thy / fear ful / sym met / try?

from "The Tyger" by William Blake 

The anapest  is two unstressed syllables followed by a stressed one: 
Bu da pest / is a pest

Finally, there is the dactylic 
di no saurs / fly ing high