3gds pro 900 usd vs. unity pro 1500 usd: unity probably a better investment. if you can or have to invest in an advanced but easy to use engine, and want to earn money of your works as fast as possible. but there are other good options too in the market, which can be better sometimes than these 2 ones.

for toying, it does not matter what engine you use, you will definitely make crap.

for a bit more serious hobby development, it heavily depends on your requirements, spare time, and budget what to use. because of no tight deadlines and no AAA quality expected, you can use less advanced or less user friendly softwares, but the result not definitely will be shit. it can be nice and fun to play with, if you are talented.