The 50 is more expensive but typically saves you money in the long run.

The 30 sized are a lot of fun, but they do come with a pretty lowsy muffler, and only the most basic parts; wood blades, plastic swash.... also the engines are a bit more finicky for tuning so some days you can spend more time tweeking than flying it.

The 50 typically comes decked out with all the goodies for only about 100$ more, carbon blades (save them for later though) great muffler, metal swash, carbon frame brace. the extra power comes in handy even for a beginner, it provides flyable power even when running extreemly rich so there is virtually no risk of over heating and it will at least fly at just about any setting. there are a lot of new things to learn when starting helis, not having to deal with a finicky engine sure makes it a lot easier.

I started wth the TT39, it was a blast, but it did require a lot of tweeking and got out grown in only 3 months. i upgraded it to a 50, but it was suprizingly expensive upgrade, and i still didn't get he carbon baldes or other goodies, better to buy as a kit.

The 50 is a big boost in power, i am already shopping for a 90 (more power is great!) , but i am quite sure a 50 will be in my trunk every saturday morning for a long time yet.