When comparing Klipsch Image S4i Rugged vs Koss i150, the Slant community recommends Klipsch Image S4i Rugged for most people. In the question“What are the best rugged and durable earbuds & IEMs that last?” Klipsch Image S4i Rugged is ranked 7th while Koss i150 is ranked 12th. The most important reason people chose Klipsch Image S4i Rugged is:
Klipsch S4 earphones have excellent response at both the high and low ends of the audible spectrum, providing clean and undistorted sound.
Specs
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Pros

Pro Crisp treble and solid bass
Klipsch S4 earphones have excellent response at both the high and low ends of the audible spectrum, providing clean and undistorted sound.
Pro Clear call quality
The built in mic provides a good experience when talking on the phone.

Pro Numerous controls accessed with 3 buttons
The S4i's buttons recognize combination presses, tap patterns and held buttons, allowing access to many features: call answering, voice control, song titles, etc. These controls are intended for use with iPhones.

Pro Very secure fit
These headphones come with four different sets of silicone plug tips, allowing a snug fit for nearly any size or shape of ear.

Pro Built for outdoor and sports use
Klipsch S4i Rugged earphones are designed to withstand extreme conditions in both activity and environment.
Pro 4ft cord
Cord is long enough for all uses.
Pro Clear Balanced Sound
Crisp and clear sound. Quite good for earbuds of this size.

Pro Warranty supported after over a decade and a half
There are tons of stories from customers that talk about how they supported their warranty after decades with no receipt, at only the cost of shipping and handling. Koss really means it when they say lifetime warranty.
Cons

Con Controls are designed for Apple products
The built in controls are only guaranteed to work with iPhone 3GS and onward. (The Klipsch S4a, designed for Android devices, does not have a rugged version.)
