With perches you want your birds feet to change shape and how big and small they are. A perch that is the perfect size for their feet should be their sleeping perch.
This is a grape wood perch, it changes in diameter throughout and it exercises their feet really well.
Rope perches
very popular, they are soft on feet and give birds a break from always standing on a hard perch. Because these perches are cotton if your bid eats it(any cotton toy) they can't digest it and it can get stuck in their digestive system. Rosie has a cotton rope but I don't give her any cotton toys. This type of perch must be carefully maintained to make sure there are no loos strands(birds may bite them free) or areas where our birds can get their toes stuck.
This is a sisal rope perch. Sisal is commonly found in hardware stores but should only be purchased if they are specifically for birds. Preservatives are used in sisal and it is extremely bad for birds, I bought a sisal rope from the osh once that said completely natural, but when I opened it smelled so strongly I new it wasn't at all safe.
Java wood can be a great perch, some places even sell them textured. Most will be sand blasted and very smooth. This can cause your bird to slip and give them bumble foot, but it also may work out fine.
Manzanita have the same problem as java, they can be slippery. Rosie has two older manzanita perches that have texture to them from wear so Rosie doesn't slip
This next one is one of my favorites next to grape wood. This is Dragon wood. It has a soft bark that birds love to scrape off and comes in many different sizes
One perch that I think is a must for any parrot owner is a safety pumice perch. You can get these perches in several forms, one as a bamboo perch and another as colorful plastic perch. These perches have smooth tops to protect your birds feet from sores, and very rough textured sides. Eventually the texture will rub away but it takes a while and eve after you can still use it as a perch. With this perch you don't have to clip your birds nails. I use to have scratched hands all the time, it would freak out my mom and she thought I would have a rash. Within two days of using the safety pumice perch I haven't been scratched by Rosie's nails since.
Using a calcium perch can also be great, I use the below type that is a calcium and mineral perch. I wish they sold a pure calcium perch though.