Demo each model and compare. A300's are discontinued now unless a dealer has some still on the lot. The new A770 will replace it.
Since nobody has a A300 style machine to compare, I think we just found your winner. Congrats now go buy one.
You should be able to find some used units on the market. Used equipment is holding higher prices right now. New equipment prices keep going up which is helping that.
Some old customers are short with small arms so roaring oars would not be a good idea.
They have kits for this issue. Phone books to sit on, Wood blocks for left and right pedals and sticks for the levers.