Do the due diligence on the company. Some are better than others. If it all checks out, then it's a brilliant opportunity.
For Biz to Airline options, check to see if the biz company uses SOPs and simulators for training. What is their training like? What types do they operate? Some translate better than others to the airline world.
There are some downsides to flying biz. Hours/annum. You don't accumulate them as quickly as you do in the airline world. 300 compared to 800 or so.
Depending on the job, there's a lot of "sitting around" (I'm very good at it
You're a lot more autonomous compared to the normal airline pilot. You have to deal with the pax issues, clean the a/c, load bags, sort out catering and deal with the honey cart.
Upsides? You meet and talk to the pax, fly to very interesting destinations, hand fly a lot more and generally treated a lot better.
I'd be bored in a heart beat if I went back to the airlines.