Packing cubes are great for keeping things organised and for taking out and putting in a draw at the other end, but if you want to pack more stuff in then you need plastic roll up vacuum bags. The ones with a plastic zip that you use to seal them then you hand roll to get the air out, not the ones you need a hoover or a handpump for.
I use a combination, an Alpkit padded tube for plugs/adapters, a cheap AliExpress cables bag for USB cables, charger etc, slim packing cubes for underwear, socks, t-shirts and then the vacuum bags for bulkier stuff. Amazing how small you can compress a jacket to for example.
I don't think which packing cube really matters, the better quality ones are a bit bulkier and heavier, the cheaper ones tend to be lighter, but look less likely to last? Also depends what you are packing them in as to how you maximize use of space, I found the slim ones the most flexible as you can pack them side by side, or on on each side or top and bottom with other stuff in the middle or on on top of the other. The bulkier stuff is in a vac bag, but you could use a square or rectangular packing cube instead.
I have ebags slim ones which no longer seem to be available in the UK, but looks like the Amazon basics are a copy of those, also have a couple of Decathlon ones which are cheap but are still quite good.