Looks like your right. Tried looking at Asus's website and manual but Asus's spec just says Nvidia and manual has no mention of vram or specs so don't have much of concrete evidence to go by except for sites you provided.
So looks like 1050ti can also come in 2gb flavors in notebooks.
ASUS FX753VE-GC111T however does describe 2gb/4gb variants at Asus rather than just saying Nvidia.
To your original question, 2gb for 1050ti should be plenty anyway, its not likely you'll be pacing it with 2k/4k resolutions. 4GB would have been better if its optional in your picks but not a deal breaker.
But I think y520 has a lower battery life so i need someone to decide for me.
Would it be better to get a lesser capable laptop with better battey life? or a more capable laptop but lesser battery life. I don't want to make bad decisions here
"Y520 has lower battery life" - No, it has almost no battery life!
The Lenovo Legion typically ships with an IPS panel, which makes it much more useful as a portable device compared with a TN panel. Sadly, my comment about battery life is no joke - it really is 2 - 3 hours of productivity and 1 hour or less of actual gaming. But you get a slightly better CPU and a much faster SSD system disk.
Check the panel details on the Dell. Battery life is likely to be better, but no by much though - it's running pretty much the same CPU/GPU setup - and you'll have to make do with a mechanical HDD (or buy an SSD later). If the Dell comes with an IPS panel, I would actually recommend it over the Legion - battery life can't possibly be worse than the Legion. But if it comes with a TN panel, you're really in a dilemma here:
The Legion offers the superior panel but you have to bring the power cord everywhere you go. The Dell may dispense with a power cord (for a few hours more) but the TN panel will make you regret your decision every time you open the machine.
I don't think they come with IPS panels, how about the asus fx553ve though? i7-7700HQ w/ 1050 ti 2gb vram 4gb ram,only hdd and its 1tb?
all of them are at very similar price points
Can you tell me where you've seen the Legion? A link to the shop would be great. This also goes for the ASUS with the '2GB 1050TI' which I still believe must be a typo.
I don't mean to be patronizing, but if you're a student I suggest you prioritize an IPS panel above anything else. A TN panel is only useful if you leave the laptop on your desk and don't move - that's why these panels are typically used with gaming machines (or to keep the retail price down).
well i'm pretty sure the asus one doesn't have ips
I'm pretty sure the Legion does and the ASUS doesn't, so I'd say go for the Legion and bring the power cord.