I have used both now and i prefer acrylic TBH. I would say this is down to personal preference more than anything else.
I have never had any issues with acrylic not being strong enough and have done more than a dozen loops with it. If you find acrylic is too brittle, you are probably not bending probably, since there is a fair bit of give with acrylic tubing.
I don't like PETG for two reasons. Firstly what put me off is some retailers mention it is not UV friendly. I use lower wavelength UV light in my deco compare to standard aesthetic UV. Mainly because i have a ton of different UV lights about the house and the normal tubes you get are not too durable with long term use. For this reason i switched my lights out just in case, 6 weeks later, one of three are dead.
My second reason why i didn't like it is because it softens too quickly and too easily. Having been used to acrylic, i found i made far more bending mistakes with the PETG because it was harder to control the softness and evenness of the tubing. I ended up with more kinks or slight bends where i didn't want them. If i got use to PETG it would probably be as easy but definitely not easier, just a few seconds quicker on the heating up side of things.
Acrylic vs PETG in my opinion is definitely a personal preference thing. If strength and low temperature bending was so much of an issue, we would all be rocking copper and steel pipes and use pipe bending tools to cold bend.