Hairfinity Pros
Contains effective ingredients like biotin and folic acid
Affordable

Hairfinity Cons
Contains horsetail which is possibly unsafe
Pills are large/hard to swallow
Complaints about the smell of the pill
Vegetarians should know, contains collagen and gelatin

Hairfinity is a vitamin supplement that helps with hair growth. While it does contain effective ingredients such as biotin and folic acid, it also contains ingredients that can be harmful to your body and to the hair growth process.
Horsetail is not a recommended ingredient to include in multivitamins. According to WebMD, horsetail is possibly unsafe when taken by mouth long-term.
Consuming horsetail can cause your Vitamin B1 levels to drop. This is because Horsetail contains a chemical that breaks Vitamin B-1 down, causing a deficiency. If you don’t get enough B-1, you can experience symptoms such as difficulty breathing, heart damage, mental sluggishness, and hair loss. Having Horsetail in a vitamin that's supposed to promote hair growth is counterproductive. This may be why many Hairfinity users are reporting hair loss over time.
Hairfinity also contains substances that come from animals such as collagen and gelatin. This is not a vegetarian-friendly vitamin.
Based on customer reviews, the vitamins are large and smelly, making them hard for a lot of people to take consistently. The smell could be due to the fact that ingredients that derive from animals degrade quickly, and therefore smell bad.

SugarBearHair Pros
Contains effective ingredients such as biotin, folic acid and Vitamin C
Affordable
Doesn't contain any unsafe ingredients
Doesn’t contain any meat or beef by-products
Easy to take (chew and swallow)
Smells delicious
Gluten free
Dairy free

SugarBearHair Cons
For those allergic to nuts, contains tree nut oil
For those on a strict no sugar diet, contains sugar
Diabetics should request permission from doctors

SugarBearHair is a new, gummy bear hair vitamin. It contains the some of the same effective vitamins as Hairfinity but without the unsafe ingredients. They also don’t contain any gelatin or collagen, so that's good news for vegetarians. If you are sensitive to dairy and/or gluten, you don't have to worry since the vitamins don't contain any of those ingredients either.
These vitamins are chewy making them easy to take. SugarBearHair vitamins also have berry flavor that's from actual berries. They're really delicious so you could actually enjoy taking them every day.