Currently I have organized my horses into Unique breeding and Marwari breeding. Typically those right beside each other are mating pairs, but those by themselves are either getting covers from others or waiting until I get a match for them. If interested in getting a covering or a future foal, let me know. Most of my unicorn breeding lines and my other breeding lines are starting from low GP, but I will bring them up through the generations. If any do not have a matching pair, I am probably using/selling coverings for them. All of my offspring will be of higher GP of their parents and purebred. Right now I've been buying, then selling underpriced rare coats to try to help reestablish their value in sells. Most of the ones I am working on right now are breeds that I am trying to turning into breeding farms. Always check your foal's coat rarity before selling, many are valuable and underselling makes it more difficult for everyone to sell their rare foals. However, usually more money can be made by selling products from your workshops or fields. Let me know if I can do anything for you. 
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Here are some charts I made that should be helpful:
These are the different skills for different competitions. The breed's best skills do matter when choosing between Classic and Western Comps. Also, when training, you only need to complete the training with the arrows beside it (their best 3 skills) for training and competitions to fulfill the training requirements of BLUP. You'll reach 100 BLUP faster that way. Also, when BLUPing a horse, train them before taking care of them, then take care of them until they nearly reach 100 energy, then train again, then finish taking care of them. I like to feed them last so I can get all of their oats in without wasting too much time. Also, when you are able to start training while you are still working on rides, use rides last for the leftover energy after training. 

Classic:
Gallop- Dressage, Gallop, Speed
Show Jumping- Dressage, Jumping, Speed
Trot- Dressage, Speed, Trot
Dressage- Dressage, Gallop, Trot 
Cross Country- Dressage, Jumping, Stamina
Western-
Barrel Racing- Gallop, Speed, Stamina
Cutting-  Dressage, Speed, Stamina
Trail Class- Dressage, Jumping, Trot
Reining- Dressage, Gallop, Stamina
Western Pleasure- Dressage, Stamina, Trot

Here is a list of the breeds (A-Z) with which competition type they are best at (CL=classic, W= western):
  1. Akhal-Teke = Cross Country (CL)
  2. Arabian = Cross Country (CL) 
  3. Appaloosa = Gallop (CL) 
  4. Argentinean Criollo = Cutting (W) 
  5. Australian Pony = Show Jumping (CL) 
  6. Barb = Cross Country (CL) 
  7. Brumby = Barrel Racing (W) 
  8. Camargue = Reining (W) 
  9. Canadian Horse = Cross Country (CL) 
  10. Chincoteague Pony = Gallop (CL) 
  11. Connemara = Cross Country (CL) 
  12. Curly = Western Pleasure (W) 
  13. Donkey = Cross Country (CL) 
  14. Drum Horse = Western Pleasure (W) 
  15. Fjord = Cutting (W) 
  16. French Trotter = Trot (CL) 
  17. Friesian = Western Pleasure (W) 
  18. Hackney = Western Pleasure (W) 
  19. Haflinger = Reining (W) 
  20. Hanoverian = Show Jumping (CL) 
  21. Highland Pony = Cutting (W) 
  22. Holsteiner = Cross Country (CL) 
  23. Icelandic Horse = Reining (W) 
  24. Irish Hunter = Reining (W) 
  25. Kerry Bog = Cutting (W) 
  26. KWPN = Show Jumping (CL) 
  27. Knabstrupper = Trail Class (W)
  28. Lipizzan = Reining (W) 
  29. Lustaino = Dressage (CL) 
  30. Marwari = Barrel Racing (W) 
  31. Morgan = Show Jumping (CL) 
  32. Mustang = Barrel Racing (W) 
  33. Newfoundland Pony = Show Jumping (CL) 
  34. Nokota= Trail Class (W) 
  35. Paint Horse = Reining (W) 
  36. Percheron = Show Jumping (CL) 
  37. Peruvian Paso = Trot (CL) 
  38. Purebred Spanish Horse = Gallop (CL) 
  39. Quarter Horse= Gallop (CL) 
  40. Quarter Pony = Cutting (W) 
  41. Russian Don Horse = Cross Country (CL) 
  42. Selle Francias = Show Jumping (CL) 
  43. Shagya Arabian = Cross Country (CL) 
  44. Shetland = Show Jumping (CL) 
  45. Shire = Western Pleasure (W) 
  46. Standardbred = Trot (CL) 
  47. Tennessee Walker = Western Pleasure (W) 
  48. Thoroughbred = Gallop (CL) 
  49. Trakehner = Reining (W) 
  50. Vanner = Cross Country (CL) 
  51. Welsh = Gallop (CL)