Costa rica for better touristic places, hotels & beach, it can be more expensive but you gonna find more comfort and luxury places in costa rica.

bitcoin adoption seems bigger in Costa Rica if you are in the area of the bitcoin beach and bitcoin jungle

I don't know much about El Salvador but it seems more secure now, they try to develop tourism and bring more foreigner, you'll surely be welcomed there and perhaps find some good offers to stay and for doing activities.

Visit both if you can