here are some of the best SSDs and RAMs for laptop and desktop computers with 256GB capacity:

SSDs

• M.2 NVMe: These SSDs are the fastest type of SSD available, and they offer the best performance for gaming and other demanding tasks. Some good M.2 NVMe SSDs include the:
  • Samsung 970 EVO Plus 
  • WD Black SN850 
  • Crucial P5 Plus 
• SATA: SATA SSDs are a bit slower than M.2 NVMe SSDs, but they are still much faster than traditional hard drives. Some good SATA SSDs include the:
  • Samsung 870 QVO  
  • WD Blue SN550 Crucial MX500  
• mSATA: mSATA SSDs are a bit older than M.2 NVMe and SATA SSDs, but they are still a good option for laptops that do not have an M.2 slot. Some good mSATA SSDs include the:
  • Samsung 860 EVO 
  • Crucial MX300 
  • Transcend MTS820

RAM

• DDR4: DDR4 is the latest generation of RAM, and it offers the best performance for most computers. Some good DDR4 RAM kits include the:
  • Corsair Vengeance LPX 
  • G.Skill Trident Z Neo 
  • Crucial Ballistix 
• DDR3: DDR3 is the previous generation of RAM, but it is still a good option for budget-minded builds. Some good DDR3 RAM kits include the:
  • Corsair Vengeance DDR3 
  • G.Skill Ripjaws X DDR3 
  • Crucial Ballistix Sport DDR3

Here are some specific recommendations for laptop and desktop computers:

Laptop

• SSD: Samsung 970 EVO Plus 256GB M.2 NVMe
• RAM: Corsair Vengeance LPX 8GB (2x4GB) DDR4-2666

Desktop

• SSD: WD Blue SN550 256GB M.2 NVMe
• RAM: G.Skill Ripjaws V 16GB (2x8GB) DDR4-3200

These are just a few recommendations, and there are many other great SSDs and RAMs available. It is important to do your research and find the best option for your needs and budget.