there are some common things for both like available triggers, measure presets (however Hantek/Tekway added some additions in latest fw), csv exports/imports, ref and setups, PASS/FAIL, digital filters, recorder - so let's focus on diffs:
- 7" display, on Rigol 5.7"
- 800x480 resulution (real resolution, like on Agilent DSOX - not like on ATTEN , UNI-T or Tek DPO2000
where 480x234 on 7" screen available)
- 16divs with menu on and 19divs with hidden menu instead of 12divs on Rigol
- 3 times faster waveform update reducing dead times: 2500 wfms/s where on Rigol ~ 800 wfms/s
- in long memory mode with dual channel enabled 400MSs (i believe like on Instek, but never got this confirmed)
instead of 250MSs (Rigol)
- additional persistency settings (0.2s, 0.4s, 0.8s) to what available on Rigol (1s, 2s, 5s, 10s, infinite)
- selectable screen refresh rate (30,40,50 auto), they usefull in cobination of XY or persistency or avg modes.
- more math functions (A/B, B/A, A+B, A-B, B-A, AxB) - as i remember Rigol have only A+B, A-B, AxB
- on FFT additonally Flaptop and Bartlett windows available on Hantek/Tekway
- selectable sample memory 4k, 40k, 512k, 1M(single chan) - on Rigol 8k/16k, Long Mem 512k/1M (dual/single chan)
- on Hantek/Tekway a real nice dual window with waveforms (for zoom in/out, scroll, play) or waveform/FFT available
- Hantek/Tekway have quick save screenshot on USB button (for lazy ppl)
- knobs per channel - nothing shared like on Rigol
- very nice shielding on Hantek/Tekway, not that cheap "all in one box" like on Rigol. Probably ppl don't care about,
but personally i don't like a switching power supply 5cm above FPGA/memory or µC.
On the hardware side input stages are almost the same (however Hantek/Tekway optimized them for higher bw),
on the µC side Hantek/Tekway is using faster ARM9 from Samsung (S3C2440) - which explains faster waveform update.
On OS level is linux 2.6.13 running giving us of course more possibilietes to change/add
something (where you can't change anything on Rigol). This is not a real disadvantage if
you use DSO for measurments only, but is nice to have for hacks - like bw change via UART/linux shell.
End of April there will be Ethernet addon available from Hantek/Tekway, however i did designed already
similar module, so not gaps on Ethernet vs. Rigol.
The firmware is no (yet) supporting SCPI, no SDK available yet, but Hantek/Rigol are working on it -
however to stay faur "not available yet" is disadvantage.
Hantek/Tekway have no pass/fail external output - maybe not a big disadvantage for home users,
but well it is not there.
Hantek/Tekway are real quite, as no Fan inside.
I did compared Tekway and Rigol (and Atten/UNI-T) a year ago and decided to use Tekway (later Hantek sharehlders bogh Tekway, so now Tekway and Hantek are producing exact same DSO with different model names and different company logo/enclosure).
Other ppl did compared to more professional DSOs, like TDS2000C, TDS3000C, WaveAce - so you can beat with Hantek/Tekway definitely Rigol or WaveAce or TDS2000C (no TDS3000C is comparable, but in my private opinion better even if ppl who did compared think different), some ppl compared to UNI-T CEL series and decided to stay with Tekway/Hantek.
For sure i'm Tekway/Hantek enthusiast (so my opinion didn't really matter), but i think the
clear visible differences are enough to make a choice.
EDIT: are you from US? If so check mortoncontrols.com (Hantek DSO - even with NIST calibration and data), or electrolab.com (Tekway).
For sure ebay as always, or goodlucksell, or if you don't care about purchase from europe pinsonne-elektronik.de from Germany or elec3i from France.