Before considering an altcoin, one would certainly want to look into its history and compare it with others. Pointing and clicking in web browsers can be good for initial exploration, but data analysis is not really easily possible with more than a handful of altcoins before the plots get too busy.
Besides, the market is full of those already doing more or less the same thing:
https://coinmarketcap.com/
https://onchainfx.com/
https://coinlib.io/
If you want to do some simple statistics or plot data yourself, perhaps you would look to download csv files. Here is the first website I found easy to interact with but with a very limited collection of altcoins with hourly granularity:
https://www.bfxdata.com/datadownload/
Beyond that, you will likely need to do some programming, pull data using APIs or download packages in your preferred language that will give you the data you need. Then you can start enjoying the world of alts that undergo renaming, currency exchanges with very low trading volumes, missing historical data of just your favorite altcoin, inconsistent timestamps although all coins are recorded digitally and so on. Perhaps it is in the nature of the beast that such data is not readily available and requires more intense development before it can be simply downloaded by everyone. However, there is light at the end of the tunnel.
Here some less intuitive but in my opinion excellent examples:
https://github.com/CoinCapDev/CoinCap.io
https://cran.r-project.org/web/packages/crypto/crypto.pdf
https://www.kaggle.com/akababa/cryptocurrencies
Enjoy digging!!