• Mangadex
  • Uploads without compression
  • Best reader UI
  • Uploads from various scanlation groups
  • No official translations since it was created for fansub
• Comick
  • Minimal compression
  • Aggregates from various scanlation groups
  • Has official translations
• Mangasee | Mangalife | Atsumaru
  • Has official translations
  • Compresses chapter images
  • Chapter updates are relatively slow
  • Atsumaru scrapes from Mangasee but has better UI
• Colored Manga
  • Uploads without compression but mostly Shounen centric
  • Has both B&W and colored releases
  • Uploads official translations & volume releases (if available)
  • Lacks in library and upload schedule
• Mangapark
  • No Compressed uploads (If source had no compression)
  • Has official translations
  • UI is a bit cluttered with no upload tags
• Batoto | Mangatoto
  • Has official translations
  • Has some exclusive uploads
  • Indexing is poor quality

For kinda niche manhwa and manhua you can check out Manga Buddy, 1st Kiss Manga & Mangacultivator