I do not know about Atten.
But I know quite well Rigol DS1052E, Siglent SDS1102CML and some Owon models.
Absolutely best sampling quality and best TFT screen is in Owon. Also it have battery option. Previous some internal noise problem is solved and is same level as in these other two what I know. Owon have FULL speed 10M memory for both channels. It can do 1GSa/s down to 0.5ms/div (with samplerate it beats these other two totally. Sampling fidelity is best, it do not use many separate ADC,s interleeved system. Owon use single chip 2x500MSa/s ADC (same principle as Rigol DS2000) Also this advantage can see with Owon FFT what is Super if compare to this Rigol or Siglent model.
Siglent and Rigol have half speed 1 and 2M memory. (with long memory 500Msa/s is maximum.
Siglend have also 6M recorder memory for slow timebases.
Siglent have true dual timebase ALT.
Building quality is least as good as Rigol. Siglent have extremely low noise fan. Front panel encoders are least as good as in Rigol DS1000. Also Siglent have real glass (not glossy) front of TFT surface.
Perhaps it is not so beautiful caase but thiss is not quality question. In use, feel of siglent is "Robust".
Also SDS1102CML is designed ready for 100MHz and no need any hack gaming joke.
But, honestly, this do not at all mean that Rigol DS1000E is crap in my opinion. It is still good nice scope. How I know Rigol. I have previously sold (and so also tested couple of) Rigol's
Rigol have shared vertical adjustments for both channels. Siglent and Owon have separate adjustments for both channels.
If I need set these order for very common entry level use and if prices aree nearly same then in this case.
Siglent. (but not oldest manufature versions in this serie )
Rigol (but only due to perhaps cheapest price)
Owon (most expensive, only newest versions is recommended (if seller do not exactly know his manufacture lot is free of problems) and there may be lot of older versions in some stocks - careful!)
but if have some special needs (signal sampling fidelity, maximal sample speed, very good 800x600 8" display, Battery ets... then Owon is perhaps over these two, also good to note that Owon beats clearly these two if look frequency bandwidth....)