ant_gamal, that is very hard to predict without holding them side-by-side. Also 'better' is somewhat general, it'd help to know what you mean by that. Higher screen resolution? Deeper blacks? Improved color saturation? Brighter (measured in nits)? Etc.
I'm going to guess that by most objective measures, the Samsung screen would come out as the 'better' one. They are the leader in display tech for a reason. But, often you pay dearly for that. And, I think most folks--including myself--would be hard pressed to tell much practical difference between the M5's display and a similar-size Samsung amoled, in daily usage. I owned a Huawei M5 8.4" tablet briefly, plus I own and have owned many Samsung devices--phones, tablets, tv's. And that M5 screen was just gorgeous, I enjoyed it just as much as any Samsung device I've owned. I don't think you'll go wrong getting either one. The M5 series is going to get updated to Android 9 shortly, so they'll be on par with the S5e in terms of OS version, too.
If you look at cost, there's not going to be much difference. Current M5 series, the 8.4" costs $319 at Amazon, the M5 "lite" 10" tablet is $299, and the M5 Pro (which has specs closer to the new S5e) is $449. So, I'd check out the specs carefully. The S5e at around $400 is going to be tough to beat for a "budget premium" tablet, its pricing is quite good given the specs.
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