Yea,I grew both.

Here are pics of both,I believe they started out roughly the same size.

My Thai giant easily sailed through winter indoors,not so with the Borneo giant but in all fairness I potted the B.giant in crappy black potting soil )-:
Borneo giant takes longer to get big,it needs to be over wintered every year and eventually grows a trunk.

As far as growth is concerned(as you can see),Thai giant is the winner by far-

Another one to consider-although VERY similar to Thai giant is Jack's giant.

Where are you getting them from?

Borneo giant-July 28th

Thai giant-Aug 6 it had just grown that 3rd leaf....
someone stole the biggest leaf a week or 2 before.

Borneo giant is a nice to grow for sure,I may try and get another (-:

I'm going through brians botanicals. I'll opt for 2 Thai Giant then...Thanks for the help. I'm looking for growth, and I couldn't even get Thai Giant to overwinter, so if Borneo Giant is that hard, then it's not worth it. I'm also probably ordering a couple Musa Mekong Giant bananas. Supposed to be like Basjoo, but on steroids and able to grow in shade. They're worth a try.

Sounds good,that's where(BB's) I got mine last year.

Is the weather warming up at all there?

My Thai giant didn't do much until June last year,
the same one in the picture is planted out now-opened it's first leaf yesterday(-:

That is odd, I have what I think they call Italian Alocasia, and it survives the winter and its so tropical looking. Mine is verigated. Even when I dug it up to transplant it, any old roots that I left started growing again. So now I have two clumps and I am amazed its survives cold zone 7a and maybe with mulching it could survive a 5b or 6a-b? I'll post a photo soon. They send their tubers way way down deep, that's why they are hard to move around. They just keep growing back and send up some sort of large jack in pulpit flower like a trilium.

Greg the plant you have is probably arum

I grew alocasia borneo giant and it never grew big for me and it rotted while it was indoors

Here is a link that might be useful: arum

Yeah, we're looking at 70s for highs for the last few days as well as for the coming forecast, with even some 80s. We're having a La Nina spring, so weather is cooler and wetter than normal.

I saw some Thai Giants on ebay, but I feel more comfortable going through BB since I went through him last year and what he sent me was obviously a Thai. How did you overwinter your Thai? I had mine under grow lights and watered it and it still rotted. Temps were mid 60s where I had it.

I did visit a local high-end nursery today. They had Borneo Giant in a 3 gallon size, plants were about 2 1/2 to 3 feet tall, but they wanted $50. Seems really overpriced for an elephant ear. I decided it wasn't worth it, especially if it doesn't perform like Thai Giant.