I use both. MW office is much easier to learn, much convienient user interface. But Genesys has some wizards to design circuits. So you can use these wizards, and can go to MWO to compare the results. Sometimes, Genesys gives wrong results. For example, I designed a filter at center freq. 14 GHz, but in EM simulations, I saw 14.5 GHz, 500 Mhz discrepancy is really much. You have to be carefull when using Genesys.
When You use EM simulations You will always have freq. shift. For example in ADS differences between model simulation and momentum, on freq. like 14 GHz are usually 1 - 2 GHz. I always trust momentum. Model analysis I use only to estimate start parameters.
To max232:
To compare two softwares You have to take into account:
-user interface
-for em simulation which method is used (Mom or TDFD or ...) its important for possibilities and memory of Your computer. Of course if You need it.
-what kind of application You will run on it (available models, possibility of exporting and importing of results, models, etc.)
Then You have o decide yourself what suits You the best. Personally I think that MW office is quite good when we talk about possibilities and interface. Also I know results of some simulations compared with ADS and HFSS. Results from MWoffice were almost identical with measurements of designed device when ADS and HFSS were rather far away from the truth.
