There're many big guys in VPS hosting industry that you can rely on, however according to me, there're 3 big guys that I usually use to host a large number of websites on them. 3 of them are Godaddy, Vultr and GreenCloudVPS.
With Godaddy, I usually get big discounts via email, the most percent discount I've got are 30% off and 25% off on new orders, this's include VPS packages orders. More, they have a very professional and comfortable control panel that can help me much in domain and hosting management. Very easy to transfer or renew when I need to do. When my domains or hosting get expiring, I've always get notification by them, at least before 3 months, that's very good.
With Vultr, They offer SSD VPS at an affordable price, uptime is good. Their customer service is great too. With Vultr, you can create new servers within a minute with the price as low as only $5/month. They also allow hourly billing, which is good for one time experiments where you can launch lots of servers for some period without paying much. Lots of tutorials available to help you out when you're stuck, so even if you're new to server admin stuffs you can easily get things done.
With GreenCloudVPS, they have a very good and friendly support team that can help you almost instantly, I've contact them many times and each time was let me very happy and rate them 5 stars in supporting. GreenCloudVPS also give monthly coupons that can help you save 25% off on your VPS purchasing. Especially with GreenCloudVPS, you can host and run some SEO tools such as GSA, XRumber,...
So I would like to recommend 3 VPS providers above to you. I hope this helps.
Good luck to you!
