I think as a Mechatronics student you may not be being asked the right questions. For instance if you are working on anything with high voltage motor drives you will want a scope with floating scope channels and a CAT rating. Safety is important when working around such electronics. While you can get by with less in other parts of an automation system such scopes really shouldn't be used on drives where you need to reference none grounded buses. You can of course use isolating probes but that becomes another issue.
I bring this up because "Mechatronics" can imply such systems. The problem is these sorts of scopes, such as Fluke's Scope Meters can be expensive. I don't see a lot of them on the used market either. On the flip side, in industry you can go for years even in a large plant, before you actually have a drive that will require you to work on it.
As for your specific questions I haven't used either model. However when I first started hearing about ATTEN it wasn't good news. As for Tektronix they seemingly have abandoned the market for this type of scope. At least CAT ratings are hard to find as are other parameters for scopes suitable for high voltage use.
As for loosing features you need to determine what features you need in the first place. I could be completely wrong about your Mechatronics focus. More so it sounds like you are in the early part of your college career and as such cheap is probably more important than anything else. This is where the comments about USB based devices come into play, with your PC (a requirement for school these days) such solutions can be a cheap and effective way to get through college. They are not however maybe not as useful as traditional scopes. I say maybe because USB based instruments are improving almost daily, especially with USB3/USB-C with all of its various types. Some of the first USB based devices where pretty bad. Another thing to consider is that USB based scopes, at the higher end, can pack neatly into a back pack with your laptop. I'm thinking PicoScope 2000 here as a low end solution and of course hey have far more expensive units.
Lets face it, even Keysight has USB based instruments these days not that I'm suggesting those high priced units. The point is you can find well done USB solutions, I'd just make good and sure you understand the state of the hardware AND software you are buying into. At some point though your hardware and software costs matches more traditional scopes so you need to consider that.
Now for a different opinion; Dave over on the EEVBlog has a rather negative view of USB scopes expressed in a 2009 video. It may be worthwhile to consider what he has to say, realizing of course that the video is a decade + old. I'm a bit old fashion so I must admit to liking buttons and knobs, however compactness is a real quality and I might consider a USB solution for an electronics lab setup simply to save on space - space taken up by a big PC screen. The PC is pretty essential to electronic development these days and as such has a place on the electronics work bench, if that PC can do double duty as an instrument interface it can be a significant plus. At least in some cases. Sometimes spinning a knob is more useful than struggling with a PC interface.
One other thing to realize is that if you buy an Analog Discovery or a very low end Picoscope they don't suddenly become worthless when you buy a real scope. Rather they just become another component of your electronics Lab. It is sort of like having multiple multimeters, there is good reason to have more than one even if you have a favorite that gets used all the time.
Im on my 3rd semester uni studying Mechatronics engineering, i was thinking to buy an Osciloscope but confused which one to buy between 2 scopes
my first choice is the Tektronix ths720a (used)
priced at around ~170$
and the second choice is ATTEN Digital Oscilloscope ADS 1022CL+ (used but like brand new )
priced at around ~240$
im leaning on the tektronix because its a more name brand, but its a handheld one, will this make me lose alot of features or not?