These are not the same size of amplifier: PS Audio Stellar Strata MK2 has roughly 2x the power of PS Audio Sprout100. That is about 3dB, so it is a question of room size and how hard your speakers are to drive, not of one being the better amplifier.
| Area | Better | Why |
|---|
| Power | A | PS Audio Stellar Strata MK2 has more power - 100W against 50W into 8 ohms. That is about 3dB, so it plays usefully louder before it runs out and has more in hand on peaks. |
| Room size | depends | We rate PS Audio Stellar Strata MK2 the better fit for a mid-size room, a large room and a very large room, and PS Audio Sprout100 for desk or near-field listening and a small room. Match the amplifier to the room you actually have, not the one you want. |
| Grip on hard loads | B | PS Audio Sprout100 holds up better into a 4-ohm load: its output nearly doubles to 100W, where the other increases strongly. That matters with demanding speakers far more than the 8-ohm figure does. |
| Built-in DAC | B | Both decode on board, but only PS Audio Sprout100 handles DSD. |
| Analogue inputs | B | PS Audio Sprout100 takes more analogue sources - 2 against 1. |
| Shelf space | depends | PS Audio Sprout100 takes up about 78% less shelf area (329cm² against 1481cm²), and it is 135mm shallower, which is the measurement that decides whether a rack door shuts. |
| Price | B | PS Audio Sprout100 costs less - $799 against $3,499 at list. |
| Watts per dollar | B | PS Audio Sprout100 is the cheaper watt - about $16 per watt against $35. A blunt measure, and it says nothing about how either sounds, but it is the honest one for raw output. |
A PS Audio Stellar Strata MK2 B PS Audio Sprout100
depends neither is better in the abstract - it turns on your room, your system or how you will use them. Only specs published for both amplifiers are judged; anything missing on either side is left out rather than guessed.
Which should you choose?
PS Audio Sprout100 is the easier recommendation: it leads on most of the measured areas and costs less. Take PS Audio Stellar Strata MK2 if one of the "depends" rows above describes your system. If your speakers are a difficult load - 4 ohms nominal, big woofers, or a sensitivity in the low 80s - PS Audio Sprout100 is the safer partner, because how an amplifier behaves when the impedance drops matters more than its 8-ohm rating. Start with the room. In a large or open-plan room, or with speakers that are hard to drive - low sensitivity, or an impedance that dips - PS Audio Stellar Strata MK2 has the headroom, and headroom is what stops an amplifier hardening up on peaks. At desk distance or in a small room, 50 watts is already more than most people ever use, and the extra 50 watts would be headroom you pay for and never hear - we rate PS Audio Stellar Strata MK2 poorly for near-field use for exactly that reason.
What a spec sheet cannot show: how either sounds with your speakers, how the controls feel day to day, and what the app is like to live with - which is where most all-in-one amplifiers are actually won or lost. Power figures are the manufacturers' own and are not measured to a common standard, so treat small differences as noise. If you can hear both, that will tell you more than any row above.