We tend to do the shopping in Aldi and Lidl with the pickups from Tesco for gluten free options but appreciate the need for online delivery. I feel online they're much and such with discounts and offers taken into consideration.
In terms of tips, lists lists lists. I can't recommend them more. We type out a list every week on Apple Notes which goes from Thursday to Thursday (Thursdays are quieter for us shopping) and this will have each day and what meal we plan on having, then we work through the aisles. Going veg, meat, cupboard items, freezer items and any extras like desserts, alcohol etc etc. Sounds like a big old faff but after a month or so its just a copy and paste job unless we've found a new recipe to try out. Also works well for us because we can share the burden of typing it together. Having lists like this means we seldom do a 'second trip' to the shops, saving time and money.
Also worth pointing out that most of the supermarkets offer 'order again' or 'favourites' facilities online so after a few shops, you can click a button and it auto populates the shopping list based on previous orders. Easy to keep track of money spent this way too.
Re ordering from Hello Fresh/Gousto
Sometimes its a case of having more money than time or more time than money, just got to make the right decision for you. I've seen me order from the likes of these when offers are on so I will have an easy week but realistically, I wouldn't say there is a huge difference overall.
If I write a list up for a typical working week shop, get it delivered and prep tupperware boxes to be frozen for lunches and dinners, it'll take me 3 hours max and cost ~£70 for two for 7 days, including breakfasts and lunches. If I order a meal box, it'll take 25mins tops and cost £40 for 5 days of dinners but I'm still going to have to prep and cook and then I still have to worry about breakfast and lunches. For me, it works out better spending £70 and a couple hours doing prep but I appreciate for some, it makes more sense to have dinners covered and pickup breakfast/lunch on the move at work.
Its a lifestyle choice, you can tell yourself its because you don't have time but if you factor in trips to pret or the corner shop, I really don't think they're hugely different. And trips to pret/corner shop might come across small but I've seen me spend £100+ a week on takeaway breakfasts and lunches.