Short answer
Both are desktop amplifiers, $350 against $399.
The SMSL HO200 reaches 100 dB on 567 of the 567 models here, the Lake People G103-S Mk II on 566.
| Specification | Lake People G103-S Mk II | SMSL HO200 |
|---|---|---|
| Power into 32Ω | 1.0 W | 3.0 W |
| Power into 150Ω | 804 mW | 640 mW |
| Power into 300Ω | 580 mW | 320 mW |
| Power into 600Ω | 340 mW | 160 mW |
| Output impedance | 0.1 Ω | <0.1 Ω |
| Output noise | 6.15 µV | 1.0 µV |
| Price | $350 | $399 |
| Headphones it reaches 100 dB on out of 567 | 566 | 567 |
| Load | Lake People G103-S Mk II | SMSL HO200 |
|---|---|---|
| 32 Ω | Published | Published |
| 150 Ω | Derived | Derived |
| 300 Ω | Published | Derived |
| 600 Ω | Published | Derived |
Both makers publish a power rating. Lake People G103-S Mk II publishes at 32 Ω, at 300 Ω and at 600 Ω; SMSL HO200 at 32 Ω. The other rows are worked out from those.
So the two columns are not equally firm row by row: at 300 Ω and at 600 Ω only the Lake People G103-S Mk II figure is the maker’s own. On those rows the derived number is the one to doubt first.
1 headphone reaches 100 dB on the SMSL HO200 but not on the Lake People G103-S Mk II — Symphonium Titan.
97 headphones stay below the audible-hiss threshold on the SMSL HO200 but cross it on the Lake People G103-S Mk II (64 Audio Fourte, 64 Audio Nio, 64 Audio U12t, 94 more).
566 of the 567 models here reach 100 dB on both.
Headroom is at a 100 dB SPL peak.
The widest gap on the list is the Shure SE846: SMSL HO200 has +49 dB of headroom there against +38 dB. 11 dB is about 12 times the power, which matters for peaks rather than for how loud the music sits.
Hiss below about 20 dB SPL is inaudible in a quiet room.
| Headphone | Impedance | Needs | Lake People G103-S Mk II headroom | SMSL HO200 headroom | Lake People G103-S Mk II hiss | SMSL HO200 hiss |
|---|---|---|---|---|---|---|
| Shure SE846 | 9 Ω | 0.04 mW | +38 dB | +49 dB | 30 dB | 14 dB |
| Campfire Audio Andromeda 2020 | 9 Ω | 4.0 mW | +18 dB | +29 dB | 10 dB | -6 dB |
| Audeze LCD-2 Classic | 70 Ω | 0.79 mW | +32 dB | +32 dB | 8 dB | -7 dB |
| Beyerdynamic DT 1990 Pro (250Ω) | 250 Ω | 0.63 mW | +30 dB | +28 dB | 4 dB | -12 dB |
| HiFiMAN HE400se | 25 Ω | 7.9 mW | +20 dB | +27 dB | 3 dB | -13 dB |
| Audio-Technica ATH-R70X | 470 Ω | 1.6 mW | +24 dB | +21 dB | -3 dB | -19 dB |
| Sennheiser HD 600 | 300 Ω | 6.6 mW | +19 dB | +17 dB | -7 dB | -23 dB |
| HiFiMAN Susvara | 60 Ω | 50 mW | +14 dB | +15 dB | -9 dB | -25 dB |
The SMSL HO200 costs $49 more than the Lake People G103-S Mk II. Out of the 567 models here, that difference buys 1 more model driven to 100 dB and 97 more models kept below the audible-hiss threshold.
Nothing runs the other way: there is no axis here on which the cheaper of the two does better.
Only published figures count here; blank axes are counted separately.
Each in full: Lake People G103-S Mk II and SMSL HO200.