I'm surprised your breeder has suggested neutering, unless there is something in the line they're not admitting to.
All I can suggest is read, read, read - and make your own mind up.
Having done the same, my choice would be to leave intact, assuming I ever have another entire dog. Don't forget, once it's done you cannot change your mind.
Rescues generally see the effects of irresponsible/accidental breeding and act accordingly.
It's not done to people (more's the pity IMNSHO), so why put your pet through it, just for convenience?
And make d*mn sure your dog does not get out!
I've had 3 basenjis, only one had seizures, started about age 15 and not frequently - had increased to approx monthly by the time she was PTS (unrelated to seizures).
I now have some kind of crossbreed terrier, we think she's about 17, and she's had seizures on 3 occasions in the last 6 months.
My first basenji had full blown seizures (lying on her side, paddling, pooing) but they were 3-4 months apart. Vet said until they occurred more frequently, it was better not to medicate. Took her about 4h to recover. A year later they were happening about once a month but she was PTS for an unrelated reason (spleen/liver/stomach tumour - she was 16).