For starter Borneo and blood are not a beginner species they are very rewarding animals to keep but not something to get stated with.
Second when choosing a species it comes down to expectations and ability to meet optimal requirements.
Will the animal be held a lot will the animal mainly be on display, if yes to both BP make a poor choice, they are prone to stress, spend 80% of their time hiding and often frustrate their new owners, they are not as forgiven as other species.
Corns, Milks and Kings are a great choices however they are fast moving and you need to keep up with them when handling, musking may also be a temporary issue especially with young animal, they eventually will grow out of it with consistent work.
Hognose are great but it is to keep in mind that while they very rarely bite they are rear fanged animals with a very mild venom, and swelling can occur if bitten.
Carpets while great can reach a nice impressive size depending on the locality and will require to be worked with, they do have a tendency to be bitty when young.
Bulls and Gophers are often more bark than bite but still can be pretty intimidating
Boas are great choices too however keep in mind that their size is nothing compare to other species listed.
The rest is really about researching their husbandry and see which might be a better fit than the other.
My vote would probably be Milk,Corn or King they are very forgiven when it comes to husbandry, they can reach a nice size without being overwhelming either.