Better" is defined by which camera will suit your needs and budget. The classic Holga 120 or 120 TLR will make the square images with the characteristic vignetted (darkened) corners, but 120 film is more expensive per photo, harder to find and more difficult to get processed, since most 1-hour film labs can't handle 120 film without having to send it out. I usually recommend lo-fi 35mm cameras to film newbies, but if you already shoot film, you have a good idea of what you are getting into and may be willing to take on the extra work and cost of shooting 120 film.
The advantages of a 35mm lo-fi camera is that it will offer a different kind of photo, while using your current methods of getting your film processed. This may be the simplest approach if your desire is to experiment with the least amount of fuss. I haven't tried the Holga TLR, but I do shoot with other TLR cameras.
Some of the interesting things about TLRs are the flipped perspective, and the ability to shoot more candid photos, since most people won't realize you are pointing the camera at them. For more info on lo-fi photography, check out my website: http://dianacamera.com For how to videos for Holga and other lo-fi cameras, check out my YouTube channel: http://www.youtube.com/kaituba.
It's easier to get film for the 135BC, but both are over-priced cr4p, sold to morons who don't know any better. There are any number of used film cameras available, just pick something decent.
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