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Desktop DSO for hardware and firmware development of MCU systems
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Wilson__:
One poster kindly pointed to the ngscopeclient software.  Scanned doc, amazing and promising.  One driver was developed in Siglent SDS2000X Plus.

Is Siglent SDS2000X Plus firmware enough aged, stable and no-issue for normal use?  Amazon says was released July 2021
NE666:
When it comes to a separate LA you might want to take a look at Digilent's "Digital Discovery".

It's at the upper end of the price range of the other LAs you've listed but it has a lot of additional functionality too (including SPI and I2C slave/host capabilities). The spec sheet says that it supports up to 800MS/s on 8 channels, supports up to 24 channels in total and is good for 100Mhz input signals. Importantly, their (free) WaveForms software looks pretty good, as does their support.

I noted earlier today that the ngscopeclient project claims to support the Analogue Discovery devices already. Given that they use the same WaveForms software as their digital kin, perhaps the latter is also supported by ngscopeclient, or that support might easily be added relatively easily?
2N3055:
Digital Discovery is good but inputs are not protected and have very low input range, logic only.
It is more specialized thing. I use it for pattern generation, for instance.

Just get SDS2104X Plus if you can afford it.
You don't need GLScope client.
SDS2000X+ decodes more protocols than you need.
It is a fully featured scope that simply works, it is self contained and is a steal for the money.

You can get one of those cheap LA for just decoding stuff on PC, for when you are decoding long interchanges of messages when debugging software part.

Wilson__:
Effective ADC bit (ENOB) is about 1.5 to 2 less than the specification?  8 bit ADC has 6 bit real accuracy and resolve 64 steps of digital SPI signal.  Would that be enough for task below?

How much sampling rate do I need to see the signal, without risk of missing some short time glitch?  SDS2104 is 1GSa/s when all 4 ch activated, right?  For 20MHz SPI clock, 50 dots per cycle. Enough?

On speed alone, Rigol MSO5074 is exceptional high 8GSa/s for 700 UK pounds.

I need the tool to do proper design verification after MCU software function ok. 

Look at analogue waveform of signal sent between MCU and external chip over SPI.  Verify data sheet setup time, hold time.  Also, signal integity.  Smooth rise fall of signal.  No ringing, overshoot, undershoot. 

Catch any rare occurrence signal that can fail the system once in, says, every 100 hours running.  Says, "poor" power supply voltage dropped when multiple loads are switched at same time due to rare situations/software event.
KungFuJosh:
Don't consider the Righoul MSO5000 without reading this thread first: https://www.eevblog.com/forum/testgear/review-rigol-mso5000-tests-bugs-questions/
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